API Overview
Essential documentation covering authentication, API queries, rate limiting, webhooks, and testing tools. These concepts apply across all Shift4 APIs.
Authentication
All API requests require HMAC-SHA256 signature authentication. This ensures requests come from authorized clients and haven't been tampered with.
API Queries
Understand how to filter, paginate, sort, and search API responses for optimal performance and relevant results.
Rate Limits
The API implements rate limiting to ensure stability and fair usage. Understand limits and how to handle exceeded quotas.
Webhooks (Subscriptions)
Receive real-time notifications when events occur in the system. Set up webhooks to keep your application synchronized.
Postman Collection
Test API endpoints easily using our Postman collection. Quickly explore the API and validate your integration.