How do I authenticate with the Square API?

Square API uses API key authentication. Visit their developer portal to obtain your API credentials.

Does Square have SDKs available?

Yes, Square provides 7 official SDK(s) for various programming languages.

Does Square API support webhooks?

Yes, Square API supports webhooks for real-time event notifications.

Square API Documentation - Payments & POS Integration

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17 APIs

View all

Square API profile

Apideck Unified API

Accounting API

Apideck Connector

Square API integration

API styles

REST

Developer docs

https://developer.squareup.com/docs

API Reference

https://developer.squareup.com/reference/square

Webhooks

Supported

Webhooks management API

Yes

Sandbox environment

Authentication

Identity protocols

SSO / Social login

OAuth playground

GraphQL playground

API Explorer

https://developer.squareup.com/explorer

Postman / Insomnia collections

OpenAPI/Swagger specs

https://github.com/square/conn...

Free developer account

App listing requirements

Pagination style

CLI

Query Language

Community

GitHub

Custom object support

Stackoverflow tags

Integrations

Ecosystem

Square App Marketplace

API pricing

API rate limits

API changelog

Status page

https://www.issquareup.com

Open-source

Tutorials

Samples & examples

Base endpoint

GraphQL endpoint

IDE Extensions

Estimated developers

Estimated customers

Estimated users

Direct integrations work until maintenance costs outpace development. Learn when fintech teams should shift from building custom connections to leveraging data aggregators and unified APIs for scalable integration infrastructure.

What is an SDK?

Software Development Kits (SDKs) are very common throughout the development landscape. Most API providers offer SDKs to help support specific programming languages and app development paradigms, making them an integral part of an overall developer support strategy. Below, we'll define what SDKs are, explore sample SDKs, and see how SDKs differ from APIs.

What is OpenAPI? Introduction to OpenAPI Specification (OAS)

OpenAPI continues to evolve and sustain a vibrant, interconnected API economy. Here, we define what exactly OpenAPI is, how OpenAPI definitions are structured, and peek into some production implementations that demonstrate the power of OpenAPI.

How to build a great developer experience

Nowadays, Developer Experience (DX) is essential for software products. Akin to User Experience (UX), DX instead focuses on improving the developer's journey, reducing hang-ups, and encouraging success throughout their programming experience.