Merge pull request #285 from Bhumika1312/changes

Adding a new Payment API

New_APIs/Payment_API/.gitignore

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+# Node modules
+node_modules/
+
+# Environment variables
+.env

New_APIs/Payment_API/README.md

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+# PayPal Payment API
+
+Welcome to the Payment API! This project demonstrates how to integrate PayPal API for online payments. Below are some useful links and information.
+
+## Features
+- Initiate PayPal payments securely.
+- Handle payment success and cancellation scenarios.
+- Simple frontend interface for payment initiation.
+
+## Technologies Used
+- Node.js
+- Express.js
+- PayPal REST SDK
+- HTML
+- CSS
+- JavaScript
+
+## Pre-Requisites
+Before getting started, ensure you have the following:
+- PayPal Sandbox Account (for testing purposes)
+- Node.js installed on your machine
+- Basic understanding of JavaScript and HTTP concepts
+
+## Installation
+Follow these steps to install and run the project locally:
+1. Clone the repository to your local machine.
+2. Install dependencies using `npm install`.
+3. Configure PayPal credentials in the `.env` file:
+4. Start the server using `npm start`.
+5. Open your browser and visit [http://localhost:3000](http://localhost:3000).
+
+## PayPal API Integration
+This project uses PayPal's REST API to facilitate payment transactions securely.
+
+## Setup PayPal Sandbox Account
+To obtain PayPal sandbox credentials:
+1. Visit [PayPal Developer](https://developer.paypal.com/).
+2. Log in with your PayPal account or create a new one.
+3. Navigate to **My Apps & Credentials** and create a new sandbox app.
+4. Obtain `CLIENT_ID` and `CLIENT_SECRET` from the sandbox app dashboard.
+5. Use these credentials in your `.env` file as shown in the Installation section.
+
+## Usage
+- Click "Pay with PayPal" on the webpage to initiate a payment.
+- Log in to your PayPal sandbox account when prompted.
+- After payment approval or cancellation, you'll be redirected to appropriate pages.
+
+## Troubleshooting
+- Ensure your PayPal sandbox credentials are correctly configured.
+- Check server logs (`console.log`) for any errors or issues during payment initiation.
+- Review PayPal's API documentation for troubleshooting specific errors.
+
+## Enjoy! 🌟
+
+## Legal
+By using PayPal's services, you agree to abide by [PayPal's Developer Agreement](https://www.paypal.com/us/webapps/mpp/ua/useragreement-full).