By default, custom fields are not a part of the standard set of fields available in the payment processor.  Each processor has a different way of adding custom fields to its records (customer, transaction, etc.). See the processor-specific section on how to bring these into Salesforce.


Custom Fields

Braintree

Breadwinner Payments Docs

App Installation

Connect to Stripe

Connect to Braintree

Connect to Square

Connect to Payment Processor

Customer Match

Update Page Layouts

Getting Started

Guided Wizard

Transaction Level Fields

Button URL Structure

Button URL Generator

Custom Guided Wizard

Square

Stripe

Auto-match Payment Transactions with Customers

Additional Configuration

API Overview

Customer

Transaction

Subscription

Request

Response

Global API

Requirements

ERD / Object Structure

ID Locations

Technical Resources

Getting Help

Processor	Supported?
Braintree	Yes
Square	Not supported by the processor
Stripe	Yes