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+/openbills
+.env
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/conf/conf.go b/conf/conf.go
new file mode 100644
index 0000000..58dafe1
--- /dev/null
+++ b/conf/conf.go
@@ -0,0 +1,44 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package conf
+
+import (
+	"github.com/spf13/viper"
+	"log"
+)
+
+func init() {
+	viper.SetConfigName("openbills")
+	viper.SetConfigType("toml")
+	viper.AddConfigPath("/etc/openbills")
+	viper.AddConfigPath(".")
+
+	if err := viper.ReadInConfig(); err != nil {
+		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+			log.Printf("\x1b[43m\x1b[30m[warn]\x1b[0m config file not found, skipping...\n")
+		} else {
+			log.Fatalf("\x1b[41m\x1b[30m[err]\x1b[0m cannot read config file. %v\n", err.Error())
+		}
+	}
+
+	viper.SetDefault("port", "8765")
+
+	viper.SetDefault("instance.title", "OpenBills")
+	viper.SetDefault("instance.description", "Libre Billing Software")
+	viper.SetDefault("instance.url", "https://openbills.vidhukant.com")
+}
diff --git a/customer/controller.go b/customer/controller.go
new file mode 100644
index 0000000..9381c45
--- /dev/null
+++ b/customer/controller.go
@@ -0,0 +1,102 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	e "vidhukant.com/openbills/errors"
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"strconv"
+)
+
+func handleGetSingleCustomer (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		return
+	}
+
+	var customer Customer
+
+	err = getCustomer(&customer, uint(id))
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": customer,
+	})
+}
+
+func handleGetCustomers (ctx *gin.Context) {
+	var customers []Customer
+
+	err := getCustomers(&customers)
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": customers,
+	})
+}
+
+func handleSaveCustomer (ctx *gin.Context) {
+	var customer Customer
+	ctx.Bind(&customer)
+
+	err := customer.upsert()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": customer,
+	})
+}
+
+func handleDelCustomer (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		return
+	}
+
+	var customer Customer
+	customer.ID = uint(id)
+
+	err = customer.del()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+	})
+}
diff --git a/customer/customer.go b/customer/customer.go
new file mode 100644
index 0000000..5f25e2d
--- /dev/null
+++ b/customer/customer.go
@@ -0,0 +1,66 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	"gorm.io/gorm"
+	d "vidhukant.com/openbills/db"
+)
+
+var db *gorm.DB
+func init() {
+	db = d.DB
+
+	db.AutoMigrate(&Customer{}, &CustomerContact{}, &CustomerBillingAddress{}, &CustomerShippingAddress{})
+}
+
+type CustomerContact struct {
+	gorm.Model
+	CustomerID uint
+	Name       string
+	Phone      string
+	Email      string
+	Website    string
+}
+
+type Address struct {
+	AddressText string
+	City        string
+	State       string
+	PostalCode  string
+	Country     string
+}
+
+type CustomerBillingAddress struct {
+	Address
+	CustomerID  uint
+}
+
+type CustomerShippingAddress struct {
+	Address
+	CustomerID  uint
+}
+
+type Customer struct {
+	gorm.Model
+	Name              string
+	Gstin             string 
+	Contact           CustomerContact
+	BillingAddress    CustomerBillingAddress
+	ShippingAddresses []CustomerShippingAddress
+}
diff --git a/customer/hooks.go b/customer/hooks.go
new file mode 100644
index 0000000..020e1c5
--- /dev/null
+++ b/customer/hooks.go
@@ -0,0 +1,48 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	"gorm.io/gorm"
+	"vidhukant.com/openbills/errors"
+)
+
+func (c *Customer) BeforeSave(tx *gorm.DB) error {
+	var err error
+
+	err = c.validate()
+	if err != nil {
+		return err
+	}
+
+	err = c.Contact.validate()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Customer) BeforeDelete(tx *gorm.DB) error {
+  // if ID is 0, customer won't be deleted
+	if c.ID == 0 {
+		return errors.ErrNoWhereCondition
+	}
+
+	return nil
+}
diff --git a/customer/router.go b/customer/router.go
new file mode 100644
index 0000000..9db92d3
--- /dev/null
+++ b/customer/router.go
@@ -0,0 +1,32 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+func Routes(route *gin.RouterGroup) {
+	g := route.Group("/customer")
+	{
+		g.GET("/", handleGetCustomers)
+		g.GET("/:id", handleGetSingleCustomer)
+		g.POST("/", handleSaveCustomer)
+		g.DELETE("/:id", handleDelCustomer)
+	}
+}
diff --git a/customer/service.go b/customer/service.go
new file mode 100644
index 0000000..c5d7cb8
--- /dev/null
+++ b/customer/service.go
@@ -0,0 +1,73 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	e "vidhukant.com/openbills/errors"
+)
+
+func getCustomer(customer *Customer, id uint) error {
+	res := db.Preload("Contact").Preload("BillingAddress").Preload("ShippingAddresses").Find(&customer, id)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrNotFound
+	}
+
+	return nil
+}
+
+func getCustomers(customers *[]Customer) error {
+	res := db.Find(&customers)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrEmptyResponse
+	}
+
+	return nil
+}
+
+func (c *Customer) upsert() error {
+	res := db.Save(c)
+	// TODO: handle potential errors
+	return res.Error
+}
+
+func (c *Customer) del() error {
+	res := db.Delete(c)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrNotFound
+	}
+
+	return nil
+}
diff --git a/customer/validators.go b/customer/validators.go
new file mode 100644
index 0000000..6c51ad9
--- /dev/null
+++ b/customer/validators.go
@@ -0,0 +1,107 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package customer
+
+import (
+	"regexp"
+	"strings"
+	"vidhukant.com/openbills/errors"
+	e "errors"
+)
+
+// NOTE: very inefficient and really really really dumb but it works
+// TODO: find a better (or even a remotely good) way
+func validateContactField(field, value string) error {
+	if value != "" {
+		var count int64
+		err := db.Model(&CustomerContact{}).
+			Where(field + " = ?", value).
+			Count(&count).
+			Error
+
+		if err != nil {
+			return err
+		}
+
+		if count > 0 {
+			switch(field) {
+			case "phone":
+				return errors.ErrNonUniquePhone
+			case "email":
+				return errors.ErrNonUniqueEmail
+			case "website":
+				return errors.ErrNonUniqueWebsite
+			default:
+				return e.New(field + " is not unique")
+			}
+		}
+	}
+
+	return nil
+}
+
+func (c *CustomerContact) validate() error {
+	// trim whitespaces
+	c.Name = strings.TrimSpace(c.Name)
+	c.Phone = strings.TrimSpace(c.Phone)
+	c.Email = strings.TrimSpace(c.Email)
+	c.Website = strings.TrimSpace(c.Website)
+
+	var err error
+	for _, i := range [][]string{{"phone", c.Phone}, {"email", c.Email}, {"website", c.Website}} {
+		err = validateContactField(i[0], i[1])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c *Customer) validate() error {
+	// trim whitespaces
+	c.Name = strings.TrimSpace(c.Name)
+	c.Gstin = strings.TrimSpace(c.Gstin)
+
+	// don't validate if GSTIN is empty
+	if c.Gstin != "" {
+	  // GSTIN regex validation
+		match, _ := regexp.MatchString("^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}Z[0-9A-Z]{1}$", c.Gstin)
+		if (!match) {
+			return errors.ErrInvalidGSTIN
+		}
+
+		// make sure GSTIN is unique
+		var count int64
+		err := db.Model(&Customer{}).
+			Select("gstin").
+			Where("gstin = ?", c.Gstin).
+			Count(&count).
+			Error
+
+		if err != nil {
+			return err
+		}
+
+		if count > 0 {
+			return errors.ErrNonUniqueGSTIN
+		}
+	}
+
+	return nil
+}
diff --git a/db/db.go b/db/db.go
new file mode 100644
index 0000000..14b0f11
--- /dev/null
+++ b/db/db.go
@@ -0,0 +1,48 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package db
+
+import (
+	"gorm.io/gorm"
+	"gorm.io/driver/mysql"
+	"github.com/spf13/viper"
+	"log"
+	"fmt"
+)
+
+var DB *gorm.DB
+
+func init() {
+	conf := viper.Get("database").(map[string]interface{})
+
+	x := fmt.Sprintf(
+		"%v:%v@%v/%v?%v",
+		conf["username"],
+		conf["password"],
+		conf["location"],
+		conf["db_name"],
+		conf["params"],
+	)
+
+	var err error
+	DB, err = gorm.Open(mysql.Open(x), &gorm.Config{})
+
+	if err != nil {
+		log.Fatalf("\x1b[41m\x1b[30m[err]\x1b[0m cannot to connect to database, exiting.\n%v\n", err)
+	}
+}
diff --git a/errors/errors.go b/errors/errors.go
new file mode 100644
index 0000000..08d8a4c
--- /dev/null
+++ b/errors/errors.go
@@ -0,0 +1,51 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package errors
+
+import (
+	"errors"
+)
+
+var (
+	// 204
+	ErrEmptyResponse       = errors.New("No Records Found")
+
+	// 400
+	ErrNoWhereCondition     = errors.New("No Where Condition")
+	ErrInvalidID            = errors.New("Invalid ID")
+	ErrEmptyContactName     = errors.New("Contact Name Cannot Be Empty")
+	ErrInvalidGSTIN         = errors.New("Invalid GSTIN")
+	ErrEmptyBrandName       = errors.New("Brand Name Cannot Be Empty")
+	ErrInvalidUnitPrice     = errors.New("Invalid Unit Price")
+	ErrInvalidGSTPercentage = errors.New("Invalid GST Percentage")
+
+	// 404
+	ErrNotFound             = errors.New("Not Found")
+	ErrBrandNotFound        = errors.New("This Brand Does Not Exist")
+
+	// 409
+	ErrNonUniqueGSTIN       = errors.New("GSTIN Must Be Unique")
+	ErrNonUniquePhone       = errors.New("Phone Number Must Be Unique")
+	ErrNonUniqueEmail       = errors.New("Email Address Must Be Unique")
+	ErrNonUniqueWebsite     = errors.New("Website Must Be Unique")
+	ErrNonUniqueBrandName   = errors.New("Brand Name Must Be Unique")
+	ErrNonUniqueBrandItem   = errors.New("Item With Same Name And Brand Already Exists")
+
+	// 500
+	ErrInternalServerError = errors.New("Internal Server Error")
+)
diff --git a/errors/middleware.go b/errors/middleware.go
new file mode 100644
index 0000000..6d2f344
--- /dev/null
+++ b/errors/middleware.go
@@ -0,0 +1,60 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package errors
+
+import (
+	"github.com/gin-gonic/gin"
+	"log"
+)
+
+func writeLog(method, path string, statusCode int, err error) {
+	var prefix string
+	if (statusCode >= 400 && statusCode < 500) || (statusCode >= 200 && statusCode < 300) {
+		prefix = "\x1b[43m\x1b[30m[warn]\x1b[0m"
+	} else {
+		prefix = "\x1b[41m\x1b[30m[err]\x1b[0m"
+	}
+
+	log.Printf("%s \x1b[47m\x1b[30m%s %s\x1b[0m %d %s", prefix, method, path, statusCode, err.Error())
+}
+
+func ErrResponse() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		ctx.Next()
+
+		if len(ctx.Errors) > 0 {
+			err := ctx.Errors[0].Err
+
+			status := ctx.Writer.Status()
+			if status == 200 {
+				status = StatusCodeFromErr(err)
+			}
+
+			ctx.JSON(status, gin.H{
+				"error": err.Error(),
+			})
+
+			writeLog(
+				ctx.Request.Method,
+				ctx.FullPath(),
+				status,
+				err,
+			)
+		}
+	}
+}
diff --git a/errors/status.go b/errors/status.go
new file mode 100644
index 0000000..eb59506
--- /dev/null
+++ b/errors/status.go
@@ -0,0 +1,64 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package errors
+
+import (
+	"errors"
+	"net/http"
+)
+
+func StatusCodeFromErr(err error) int {
+	// 204
+	if errors.Is(err, ErrEmptyResponse) {
+		return http.StatusNoContent
+	}
+
+	// 400
+	if errors.Is(err, ErrNoWhereCondition) ||
+		errors.Is (err, ErrInvalidID) ||
+		errors.Is (err, ErrEmptyContactName) ||
+		errors.Is(err, ErrInvalidGSTIN) ||
+		errors.Is(err, ErrEmptyBrandName) ||
+		errors.Is(err, ErrInvalidUnitPrice) ||
+		errors.Is(err, ErrInvalidGSTPercentage) {
+		return http.StatusBadRequest
+	}
+
+	// 404
+	if errors.Is(err, ErrNotFound) ||
+		errors.Is(err, ErrBrandNotFound) {
+		return http.StatusNotFound
+	}
+
+	// 409
+	if errors.Is(err, ErrNonUniqueGSTIN) ||
+		errors.Is(err, ErrNonUniquePhone) ||
+		errors.Is(err, ErrNonUniqueEmail) ||
+		errors.Is(err, ErrNonUniqueWebsite) ||
+		errors.Is(err, ErrNonUniqueBrandName) ||
+		errors.Is(err, ErrNonUniqueBrandItem) {
+		return http.StatusConflict
+	}
+
+	// 500
+	if errors.Is(err, ErrInternalServerError) {
+		return http.StatusInternalServerError
+	}
+
+	return http.StatusInternalServerError
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..bc5c009
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,50 @@
+module vidhukant.com/openbills
+
+go 1.21.0
+
+require (
+	github.com/gin-gonic/gin v1.9.1
+	github.com/spf13/viper v1.16.0
+	gorm.io/driver/mysql v1.5.1
+	gorm.io/gorm v1.25.4
+)
+
+require (
+	github.com/bytedance/sonic v1.9.1 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.14.0 // indirect
+	github.com/go-sql-driver/mysql v1.7.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/spf13/afero v1.9.5 // indirect
+	github.com/spf13/cast v1.5.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.4.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.11 // indirect
+	golang.org/x/arch v0.3.0 // indirect
+	golang.org/x/crypto v0.9.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..9f2d670
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,556 @@
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diff --git a/info.go b/info.go
new file mode 100644
index 0000000..2f161a9
--- /dev/null
+++ b/info.go
@@ -0,0 +1,42 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/spf13/viper"
+	"net/http"
+)
+
+type Info struct {
+	Version     string
+	Title       string
+	Description string
+	URL         string
+}
+
+func serverInfo(ctx *gin.Context) {
+	info := Info {
+	  Version:     OPENBILLS_VERSION,
+		Title:       viper.GetString("instance.title"),
+		Description: viper.GetString("instance.description"),
+		URL:         viper.GetString("instance.url"),
+	}
+
+	ctx.JSON(http.StatusOK, info)
+}
diff --git a/item/controller.go b/item/controller.go
new file mode 100644
index 0000000..b4e27c1
--- /dev/null
+++ b/item/controller.go
@@ -0,0 +1,156 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	e "vidhukant.com/openbills/errors"
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"strconv"
+)
+
+func handleGetBrandItems (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		return
+	}
+
+	var items []SavedItem
+	err = getBrandItems(&items, uint(id))
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": items,
+	})
+}
+
+func handleGetBrands (ctx *gin.Context) {
+	var brands []Brand
+
+	err := getBrands(&brands)
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": brands,
+	})
+}
+
+func handleSaveBrand (ctx *gin.Context) {
+	var brand Brand
+	ctx.Bind(&brand)
+
+	err := brand.upsert()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": brand,
+	})
+}
+
+func handleDelBrand (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		return
+	}
+
+	var brand Brand
+	brand.ID = uint(id)
+
+	err = brand.del()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+	})
+}
+
+func handleGetItems (ctx *gin.Context) {
+	var items []SavedItem
+
+	err := getItems(&items)
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": items,
+	})
+}
+
+func handleSaveItem (ctx *gin.Context) {
+	var item SavedItem
+	ctx.Bind(&item)
+
+	err := item.upsert()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": item,
+	})
+}
+
+func handleDelItem (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		return
+	}
+
+	var item SavedItem
+	item.ID = uint(id)
+
+	err = item.del()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+	})
+}
diff --git a/item/hooks.go b/item/hooks.go
new file mode 100644
index 0000000..ddb9a44
--- /dev/null
+++ b/item/hooks.go
@@ -0,0 +1,57 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"gorm.io/gorm"
+	"vidhukant.com/openbills/errors"
+)
+
+func (i *SavedItem) BeforeSave(tx *gorm.DB) error {
+	var err error
+
+	err = checkIfBrandExists(i.BrandID)
+	if err != nil {
+		return err
+	}
+
+	err = i.validate()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (b *Brand) BeforeSave(tx *gorm.DB) error {
+	err := b.validate()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (b *Brand) BeforeDelete(tx *gorm.DB) error {
+  // if ID is 0, brand won't be deleted
+	if b.ID == 0 {
+		return errors.ErrNoWhereCondition
+	}
+
+	return nil
+}
diff --git a/item/item.go b/item/item.go
new file mode 100644
index 0000000..4da9c78
--- /dev/null
+++ b/item/item.go
@@ -0,0 +1,52 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"gorm.io/gorm"
+	d "vidhukant.com/openbills/db"
+)
+
+var db *gorm.DB
+func init() {
+	db = d.DB
+
+	db.AutoMigrate(&SavedItem{}, &Brand{})
+}
+
+type Brand struct {
+	gorm.Model
+	Name  string
+}
+
+type Item struct {
+	BrandID            uint
+	Brand              Brand
+	UnitOfMeasure      string // TODO: probably has to be a custom type
+	HasDecimalQuantity bool
+	Name               string
+	Description        string
+	HSN                string
+	UnitPrice          string // float
+	GSTPercentage      string // float
+}
+
+type SavedItem struct {
+	gorm.Model
+	Item
+}
diff --git a/item/router.go b/item/router.go
new file mode 100644
index 0000000..fab973f
--- /dev/null
+++ b/item/router.go
@@ -0,0 +1,40 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+func Routes(route *gin.RouterGroup) {
+	b := route.Group("/brand")
+	{
+		b.GET("/", handleGetBrands)
+		b.GET("/:id/items", handleGetBrandItems)
+		b.POST("/", handleSaveBrand)
+		b.DELETE("/:id", handleDelBrand)
+	}
+
+	i := route.Group("/item")
+	{
+		i.GET("/", handleGetItems)
+		//i.GET("/:id", handleGetBrandItems)
+		i.POST("/", handleSaveItem)
+		i.DELETE("/:id", handleDelItem)
+	}
+}
diff --git a/item/service.go b/item/service.go
new file mode 100644
index 0000000..c8a72f6
--- /dev/null
+++ b/item/service.go
@@ -0,0 +1,126 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"vidhukant.com/openbills/errors"
+	e "vidhukant.com/openbills/errors"
+)
+
+func getBrandItems(items *[]SavedItem, id uint) error {
+	// check if id is valid
+	var count int64
+	err := db.Model(&Brand{}).
+		Select("id").
+		Where("id = ?", id).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+  }
+
+	if count == 0 {
+		return errors.ErrBrandNotFound
+	}
+
+	res := db.Model(&SavedItem{}).Where("brand_id = ?", id).Find(&items)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrEmptyResponse
+	}
+
+	return nil
+}
+
+func getBrands(brands *[]Brand) error {
+	res := db.Find(&brands)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrEmptyResponse
+	}
+
+	return nil
+}
+
+func (b *Brand) upsert() error {
+	res := db.Save(b)
+	// TODO: handle potential errors
+	return res.Error
+}
+
+func (b *Brand) del() error {
+	res := db.Delete(b)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrNotFound
+	}
+
+	return nil
+}
+
+func getItems(items *[]SavedItem) error {
+	res := db.Preload("Brand").Find(&items)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrEmptyResponse
+	}
+
+	return nil
+}
+
+func (i *SavedItem) upsert() error {
+	res := db.Save(i)
+	// TODO: handle potential errors
+	return res.Error
+}
+
+func (i *SavedItem) del() error {
+	res := db.Delete(i)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrNotFound
+	}
+
+	return nil
+}
diff --git a/item/validators.go b/item/validators.go
new file mode 100644
index 0000000..09162ab
--- /dev/null
+++ b/item/validators.go
@@ -0,0 +1,111 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"strconv"
+	"strings"
+
+	"vidhukant.com/openbills/errors"
+)
+
+func (b *Brand) validate() error {
+	// trim whitespaces
+	b.Name = strings.TrimSpace(b.Name)
+
+	if b.Name == "" {
+		return errors.ErrEmptyBrandName
+	}
+
+	// make sure GSTIN is unique
+	var count int64
+	err := db.Model(&Brand{}).
+		Select("name").
+		Where("name = ?", b.Name).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+	}
+
+	if count > 0 {
+		return errors.ErrNonUniqueBrandName
+	}
+
+	return nil
+}
+
+func checkIfBrandExists(id uint) error {
+	// check if brand id is valid
+	var count int64
+	err := db.Model(&Brand{}).
+		Select("id").
+		Where("id = ?", id).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+  }
+
+	if count == 0 {
+		return errors.ErrBrandNotFound
+	}
+
+	return nil
+}
+
+func (i *SavedItem) validate() error {
+	// trim whitespaces
+	i.Name = strings.TrimSpace(i.Name)
+	i.Description = strings.TrimSpace(i.Description)
+	i.HSN = strings.TrimSpace(i.HSN)
+
+	var err error
+
+	// check if UnitPrice is float
+	_, err = strconv.ParseFloat(i.UnitPrice, 64)
+	if err != nil && strings.TrimSpace(i.UnitPrice) != "" {
+		return errors.ErrInvalidUnitPrice
+	}
+
+	// check if GSTPercentage is float
+	_, err = strconv.ParseFloat(i.GSTPercentage, 64)
+	if err != nil && strings.TrimSpace(i.GSTPercentage) != "" {
+		return errors.ErrInvalidGSTPercentage
+	}
+
+	// check if item with same name and brand already exists
+	var count int64
+	err = db.Model(&SavedItem{}).
+		Select("name, brand_id").
+		Where("brand_id = ? and name = ?", i.BrandID, i.Name).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+  }
+
+	if count != 0 {
+		return errors.ErrNonUniqueBrandItem
+	}
+
+	return nil
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..e40ac8f
--- /dev/null
+++ b/main.go
@@ -0,0 +1,55 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	// used internally
+	_ "vidhukant.com/openbills/conf"
+	_ "vidhukant.com/openbills/db"
+
+	// middlewares, etc
+  "vidhukant.com/openbills/errors"
+
+	// routes
+	"vidhukant.com/openbills/customer"
+	"vidhukant.com/openbills/item"
+
+	"github.com/gin-gonic/gin"
+	"github.com/spf13/viper"
+
+	"log"
+)
+
+const OPENBILLS_VERSION = "v0.0.1"
+
+func main() {
+	log.Printf("\x1b[46m\x1b[30m[info]\x1b[0m Starting OpenBills Server %s\n", OPENBILLS_VERSION)
+
+	r := gin.New()
+
+	r.GET("/info", serverInfo)
+
+	api := r.Group("/api")
+	api.Use(errors.ErrResponse())
+	{
+		customer.Routes(api)
+		item.Routes(api)
+	}
+
+	r.Run(":" + viper.GetString("port"))
+}
diff --git a/openbills.toml b/openbills.toml
new file mode 100644
index 0000000..567aa00
--- /dev/null
+++ b/openbills.toml
@@ -0,0 +1,13 @@
+port = 8765
+
+[database]
+username = "openbills"
+password = "VeryStrongPass123"
+location = "tcp(127.0.0.1:3306)"
+db_name  = "openbills"
+params   = "charset=utf8mb4&parseTime=True&loc=Local"
+
+[instance]
+title = "OpenBills"
+description = "Libre Billing Software"
+url = "https://openbills.vidhukant.com/"