Square

API

Comprehensive API for payment processing, refunds, and online checkout

Overview

Square API provides RESTful endpoints for payment processing (create payments, manage refunds), order management (online checkout flows), customer profiles, inventory tracking, and reporting. Data is exchanged in JSON format. Key endpoints include /payments for transaction handling, /refunds for reversing charges, /checkout for initiating online checkout sessions, and /orders for managing customer orders. Use cases: integrate in-app or web payments, automate refund workflows, build custom online storefronts, sync sales data with accounting tools, and personalize customer experiences.

Example Integration (JavaScript)

script.js JS


fetch('https://developer.squareup.com/reference/square')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful
JSON support
Payment processing
Refund management
Online checkout flows
Customer profile management
Inventory tracking

Frequently Asked Questions

? Is Square API free to use?

The Square API is free to access and integrate; however, transaction fees apply for processing payments (e.g., 2.9% + 30¢ per online transaction).

? Does it require an API Key?

Yes, you need an API key (or OAuth token for third-party apps) to authenticate requests to the Square API.

? What is the response format?

All responses from the Square API are in JSON format, making it easy to parse and integrate with most programming languages.

Top Alternatives

Stripe API Search Google

PayPal REST API Search Google

Braintree API Search Google

Tool Info

Pricing Freemium

Category Business

Platform Public API

Pros

⊕ Easy to integrate
⊕ Comprehensive documentation
⊕ Scalable for businesses of all sizes
⊕ Supports multiple payment methods
⊕ Real-time transaction reporting

Cons

⊖ Transaction fees apply
⊖ Rate-limited API calls
⊖ Requires account verification for production
⊖ Advanced features may require paid plans