Develop on the platform that sellers trust.
Support Square sellers by building apps for today’s business needs.
The latest from Square Developer
Extend Square eGift Cards to your app using Gift Cards API.
Sign up to our hackathon by 22 Aug. Build or add to an app using the newest Square tools.
Create, retrieve and update recurring payments with Subscriptions API.
Use our Square-hosted solution to quickly integrate payments with Checkout API.
Bridge more experiences.
Build online, mobile and in-person business experiences that connect more customers and sellers.
Build custom booking solutions
Enable sellers to create more personalised experiences for their customers with booking 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.
Manage and curate inventory
Help sellers stay organised with Catalogue API for updates to catalogue entries and Inventory API for inventory adjustments.
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
Slack
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
