API Guide

Purpose of This Guide

This API Guide is intended for developers, integration engineers, technical consultants, SI partners, and third-party application teams responsible for integrating external systems with the QuickBooks Integration platform within Salesforce.

The guide provides detailed technical documentation for API consumption, authentication, request/response structures, webhook handling, error management, and integration best practices.

This document serves as the primary reference for building, maintaining, and troubleshooting API-based integrations.

What You Will Learn

Authentication

• Supported authentication mechanisms

• OAuth 2.0 authentication flow

• Access token and refresh token handling

• Token expiration and renewal process

• Security best practices for API authentication

Base URLs & Environment Configuration

• Production and Sandbox base URLs

• Environment-specific endpoint configuration

• API versioning strategy

• Regional and tenant-specific configurations

API Limits & Governance

• Request rate limits

• Concurrent API execution limits

• Retry recommendations and backoff strategies

• Salesforce governor limit considerations

Available API Endpoints

• Customer and Vendor APIs

• Invoice APIs

• Payment APIs

• Product and Service APIs

• Vendor APIs

• Journal Ledger APIs

• Metadata and configuration endpoints

Request Examples

• Sample REST API requests

• Header and authentication examples

• JSON request payload samples

• Query parameter usage

• Bulk operation request examples

Response Examples

• Success response structures

• Error response formats

• Pagination handling

• Partial success scenarios

• Webhook acknowledgement responses

Error Codes & Troubleshooting

• Standard HTTP status codes

• Integration-specific error codes

• Authentication and authorization failures

• Validation and data mapping errors

• Retryable vs non-retryable exceptions

• Recommended troubleshooting actions

Webhooks & Event Notifications

• Supported webhook events

• Webhook payload structure

• Event subscription process

• Signature validation and security verification

• Retry and duplicate event handling

• Event logging and monitoring

Postman Collection

• Available Postman collections

• Import and setup instructions

• Environment variable configuration

• Authentication setup within Postman

• Testing and debugging APIs using Postman

SDKs & Developer Utilities

• Supported SDKs and helper libraries

• Sample integration utilities

• API wrapper examples

• Reusable request builders

• Mock and sandbox testing utilities

Intended Audience

This guide is intended for:

• Salesforce Developers

• Integration Engineers

• API Consumers

• SI Partners & Technical Consultants

• ISV Development Teams

• Middleware & Platform Teams

• External Application Developers

API Design Principles

The QuickBooks Integration APIs are designed with the following principles:

• RESTful API architecture

• Secure and scalable integration patterns

• Consistent request and response structures

• Idempotent operations where applicable

• Clear error handling and validation messaging

• Backward-compatible API versioning

Document Conventions

Throughout this guide:

• API endpoints and methods will appear in bold.

• JSON request and response samples will be included where applicable.

• Required parameters and headers will be clearly identified.

• Important implementation notes and security considerations will be highlighted.

• Example payloads may vary slightly between sandbox and production environments.

Support & API Assistance

For API onboarding, technical implementation support, webhook troubleshooting, or integration assistance, contact the Cloud Maven technical support team or the designated integration architect for your project.