Square Connect API

Develop with Square.

The Square Connect API enables you to build apps for millions of Square merchants—or a custom solution for just one.

Manage Apps Get Started

A marketplace for millions of merchants

Get your app out there.

Put your work in front of millions of business owners when you list in the Square App Marketplace.

Get discovered with a click.

Put yourself one click away from a merchant with our seamless onboarding.

Get paid automatically.

No need to worry about chasing down a payment or setting up your own billing system. Get paid with Square’s billing system and subscription APIs.

Further Questions?

Please read through our Documentation and FAQ, and try out our Code Samples! Technical questions will be answered on our Stack Overflow page. For other inquiries please email us at developers@squareup.com.