---
title: Payment Gateways
description: Payment gateways are the technologies that authorize and process credit card payments for online retailers. Learners will understand how to integrate secure payment processors, manage transaction fees, and ensure compliance with security standards.
category: business-entrepreneurship
subcategory: e-commerce
difficulty: beginner, intermediate, advanced
url: /subject/payment-gateways
---

# Payment Gateways

Payment gateways are the technologies that authorize and process credit card payments for online retailers. Learners will understand how to integrate secure payment processors, manage transaction fees, and ensure compliance with security standards.

## Available Resources

2 Websites

## Websites

### 1. PayPal Developer

PayPal's official developer portal with API reference, SDKs, integration guides, and a sandbox for testing. Developers learn to add PayPal Checkout, process orders and refunds, handle webhooks, and test payment flows with sandbox accounts before going live.

**Difficulty:** Beginner | **Price:** Free

**Link:** https://developer.paypal.com/

**Tags:** payment-gateways, paypal-api, checkout-integration, webhooks, payment-sandbox

### 2. stripe.com

Stripe is a payments platform offering API-based online payment processing, subscriptions, and related financial tools for businesses. Its site provides developer documentation, API references, integration guides, checkout components, pricing, and tutorials to learn how to implement and optimize payment gateways.

**Difficulty:** Intermediate | **Language:** English | **Price:** Free

**Link:** https://docs.stripe.com/payments

**Tags:** websites, business-entrepreneurship, e-commerce

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