Develop on the platform that sellers trust.

Support Square sellers by building apps for today’s business needs.

Square Developer

Bridge more experiences.

Build online, mobile and in-person commerce experiences that connect more customers and sellers.


Build custom booking solutions

Enable sellers to create more personalised experiences for their customers with bookings details, management and more.


Create and track orders

Take orders via web and mobile applications and send them directly to Square Point of Sale or your own custom application.


Accept payments

Connect your app to our secure and PCI-compliant platform to accept payments in person, in an app, or online.


Manage a product catalogue

Enable fast and flexible catalogue management, including individual and batch support for retrieval, updates and deletion.


Organise customers

Leverage customer data to create applications that help sellers grow their sales and build customer loyalty.


Manage employees

Integrate timekeeping or collaboration tools that support sellers and help maintain their high-performing teams.

Launch fast with Square’s developer tools

Using Square’s developer platform means less maintenance of legacy systems and more focus on core customer and product experiences.

  • Full sandbox environment
  • Interactive API explorer
  • Live event monitoring
  • Backend SDKs: PHP, Ruby, Java, .Net, Python, Node
  • Secure payment SDKs: iOS, Android, React Native, Flutter


Security & Compliance

Our payments APIs include end-to-end encryption, dispute management, fast deposits for sellers and fraud detection.


Processing Fees

Square offers simple, transparent payment pricing with no hidden fees. Square APIs and SDKs are free for developers to use. Sellers only pay processing fees for each transaction.

Available Resources

Developer Forums
Get answers to your questions from Square experts.
Visit the forums

Developer Blog
Learn what’s new and what Square engineers are working on now.
Read the blog

Discord Community
Join our developer community channel for updates and discussions.
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Direct Support
Reach out confidentially to our Developer Support team.
Direct message us

Get started