Documentation
Welcome to Square! Use our APIs to take payments securely (online, in-person, or in-app), create orders, and manage them in Square Points of Sale or a custom built application.
In App Payments
Accept credit card and digital wallet payments in iOS and Android apps with our In-App Payments SDK.
Online Payments
Choose from customizable or pre-built options to accept credit card and digital wallet payments on the web.
In-Person Payments
Connect your iOS or Android app to our best-in-class, EMV-compliant card reader, with Square Reader SDK.
Order Management
Create an order and send it to a Square or custom built Point of Sale for seamless fulfillment, with the Orders API.
Do more with Square
Use Square APIs to manage and run nearly all aspects of business including customer, product, inventory, and employee management.
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Manage customer profiles, including card-on-file payment information for future purchases, with the Customers API.
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Manage product catalogs with the Catalog API, and track product inventory with the Inventory API.
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Create and manage employees with the Employees API and track work shifts with the Labor API.
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Integrate with existing open source solutions, built on Square products, available in the Square App Marketplace.
Square SDKs
Use Square SDKs to simplify development with Square APIs.
View SDKs >Sample Apps
See Square solutions in action and download code templates for simpler setup.
View sample apps >We want to hear from you
If you have questions, comments, or just want to keep up with platform updates, there are multiple ways to reach us.
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Contact our Developer Support.
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Chat with developers on our Slack.
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Ask for help on Stack Overflow.
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Check out the latest on the Developer Blog.
Start building with Square
Not a developer?
Integrate with existing plugins built for Square products in the
Square App Marketplace
.