Mobile-Billing App

The main purpose of this application is to reduce the wait time near the billing counter in the grocery stores. We have developed a “Mobile Billing” application that will help you to automatically scan the products that you want to purchase by using QR code scanner that is inbuilt in this application and make the payments for the purchase. This application can be used by customers for self checkout while shopping. The customer downloads the app from the Android Marketplace (Play Store) and scans the items for self checkout without waiting in line to bill items in their cart. It's like having a personal checkout assistant with you always!

Functional Requirements

• The system shall scan a barcode/QR code of the product and Identify the product and price.
• The system shall display the list of available items.
• Add/Modify Shopping cart items.
• Calculate the totals, taxes and total price.
• Accept payment and complete purchase.

User Requirements

• Mobile Device (With Working Camera)
• Android OS (Version 4.4 or above)

Database Design

For this Application we have used the Google Firebase Realtime Database. The Firebase Realtime Database is a cloud-hosted NoSQL database that lets you store and sync data between your users in realtime. Realtime syncing makes it easy for your users to access their data from any device, be it web or mobile. Realtime Database also helps your users collaborate with one another.
In this NoSQL database, we have created some columns such as description, id, imageURL, name and price where each individual column has its own individual action performed in the database.

• Description: It gives a brief introduction about the item.
• id: It is a primary key.
• imageURL: This acts as an image source for the products.
• Name: Name of the product.
• Price: Price of the product.

Database Structure

Click here! for database structure.

App Features

Workflow

• Secure access with account/Google authentication
• QR Code Scanning
• Display available products
• Add/Remove products in cart
• Track billing/invoice information, Order Summary

Payables

• Access your payment history
• Checkout quickly and easily
• Multiple payment options

Receivables

• Manage products and customer
• Create invoice
• Keep track of payments received

DFD Diagrams

• DFD level-0

• DFD level-1

App Modules and their responsibilities

1. Login Page

• The main responsibility of this module is to provide authentication to App user.
• While running the App this module is considered as a home module.
• User can login using either with App mail or by sign in with google.

2. Reset Password

• In this module when the user forgets his/her password he can go into this module.
• In this module it will ask users to provide their email id for the password recovery.
• After the password has been generated they will directed to the Main Activity module.

3. Create Account

• When the user is a new one he/she can create his own account by opting this module.
• When the user clicks the Sign up button he is directed to this module.
• In this module he can create an account by providing his first name, last name, email and password.
• A verification email is sent to the User to verify the account.

4. Main Activity

• After authentication of the user he/she will be directed to the main activity module.
• User can scan the shopping items by clicking the Scan QR code button or else he can manually select the products by clicking the Products button.

5. Shopping List

• In this module there will be a grid of shopping items where user will select them and add it to the cart.
• This module is responsible to display all the available items in the store and update whenever it is needed.
• User can update and delete the items whenever he/she needed.

6. Shopping Cart

• This module is responsible for displaying user’s selected shopping items in the shopping list module.
• Responsible for showing the quantity of the selected items.
• Responsible for calculating the total price of the shopping items.
• Responsible for sharing the receipt to your friends via mail, Whatsapp etc.

Contributing

1. Fork the repo on GitHub
2. Clone the project to your own machine
3. Commit changes to your own branch
4. Push your work back up to your fork
5. Submit a Pull request so that we can review your changes

NOTE: Be sure to merge the latest from "upstream" before making a pull request!

Copyright and Licensing

This app is under open source projects and licensed under the Apache 2.0 license

License Summary

Copyright 2017-2018

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

ChandraMouli R 💻 🎨 🤔 👀

Sai Charan Reddy 📖 🎨 ⚠️ 🤔

Rewant Kumar Ponnada 🎨 📖 🐛 📓

Ameya Ingale 🎨🐛 🖋📖

This project follows the all-contributors specification. Contributions of any kind welcome!