Salesforce Billing Developer Guide

Salesforce Billing Developer Guides & Lightning Components
Salesforce Billing Payment Gateway Developer Guide
Get Started With Gateway API
Payment Gateway Core Classes
TransactionParameter Class
TransactionResult Class
TransactionResult.GatewayStatusType Enum
PaymentGatewayParameter Class
TransactionAPI Class
PaymentGatewayStatus Interface
PaymentGateway Interface
PaymentGateways Interface
Custom Gateway Classes
Salesforce Billing Tax Integration Developer Guide
Hosted Card Payments Lightning Component
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Payment Gateway Core Classes

Your payment gateway references these classes to receive transaction information from Salesforce Billing. They can't be modified.

The following are the blng namespace classes required for payment gateway integration.