API Overview

Payments Developer Guide
- Recent Revisions to This Document

Introduction to Payments
- Financial Institutions and Payment Networks
- Card Types
- Transaction Types
- Payment Services
- Testing the Payment Services

Standard Payment Processing
- Pre-Authorizations
- Authorization Reversal
- Sales
- Captures
- Follow-On Credits
- Voids for a Capture or Credit

China UnionPay Test Cards

Payment Processors

Payment processors connect with acquirers. Before you can accept payments, you must register with

a payment processor

.

An acquirer might require you to use a payment processor with an existing relationship with the acquirer.

Your payment processor

assigns one or more merchant IDs (MIDs) to your business. These unique codes identify your business during payment transactions.