Salesforce Billing Developer Guide

Salesforce Billing Fields on Standard Objects
Salesforce Billing Custom Objects
Salesforce Billing Developer Guides & Lightning Components
Salesforce Billing Payment Gateway Developer Guide
Get Started with Salesforce Billing Payment Gateway API
Payment Gateway Class Reference
CaptureInputParameter Class
CaptureOutputResult Class
Payment Gateway Core Classes
InputParameter Class
OutputResult Class
PaymentGateway Interface
PaymentGateways Interface
PaymentGatewayParameter Class
PaymentGatewayStatus Interface
TransactionAPI Class
TransactionParameter Class
TransactionResult Class
TransactionResult.GatewayStatusType Enum
Custom Gateway Classes
Salesforce Billing Tax Integration Developer Guide
Revenue Recognition Service Developer Guide
Hosted Card Payments Lightning Component
REST API for Converting Invoice Lines with Negative Balances
Set Up Standalone Orders with API
Salesforce Billing Apex Reference
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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.