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
- Basic Authorizations
- Sales
- Captures
- Follow-On Credits
- Stand-Alone Credits
- Voids for a Capture or Credit

Card-Specific Required Field for Retrieving Customer Credentials During a CIT

Discover

Discover requires the authorization amount from the original transaction in addition to the above required fields.

subsequentAuthOriginalAmount