Block
Block, Inc. is a global technology company building economic empowerment tools through a family of products including Square (commerce and payments), Cash App (personal finance and investing), Afterpay (buy now pay later), TIDAL (music streaming), and Spiral (open-source Bitcoin development). The Square API enables developers to build commerce applications with payment processing, order management, catalog, customer engagement, and business operations capabilities.
APIs
Square API
RESTful API for building commerce applications on the Square platform. Provides payment processing, order management, catalog management, customer profiles, loyalty programs, in...
Capabilities
Features
Accept card-present and card-not-present payments using Square hardware, web, or mobile SDKs with OAuth 2.0 or access token authentication.
Create, update, and fulfill orders with line items, discounts, taxes, and service charges across online and in-person channels.
Manage a unified product catalog with items, variations, modifiers, categories, taxes, and discounts synchronized across all locations.
Build customer profiles, loyalty programs, gift cards, and marketing campaigns to drive repeat business and customer retention.
Manage multiple business locations with location-specific inventory, pricing, staff permissions, and reporting.
Subscribe to real-time webhook events for payments, orders, inventory changes, customer activity, and subscription lifecycle events.
Full sandbox environment with test card numbers, merchant accounts, and simulated hardware for development and testing.
Use Cases
Retailers and restaurants build custom POS applications using Square's payment, catalog, and order APIs.
Online stores integrate Square's Web Payments SDK and Orders API to accept payments and manage fulfillment.
Multi-seller marketplaces use Square Connect to route payments to sellers and manage fees through the Payouts API.
SaaS and service businesses use Square Subscriptions API for automated recurring billing and invoice management.
Businesses implement custom loyalty programs using the Loyalty API to track points, tiers, and reward redemptions.
Integrations
Official Square extension for WooCommerce synchronizes inventory, products, and payments between WordPress stores and Square.
Square integration for BigCommerce enables omnichannel selling with synchronized catalog and unified payment processing.
Square-Xero integration automatically syncs sales transactions and payments to Xero accounting for reconciliation.
Square connector for QuickBooks Online syncs sales, refunds, and fees to QuickBooks for financial reporting.