Documentation API Lab API Reference Partner API

API version

Tenanted API

2026-10-06LatestDefault 2026-07-21

Legacy

Read the changelog

Getting Started

Getting Started with Kintsugi Creating and Managing API Keys Authenticating Your Requests

Guides

US Sales Tax for Developers Product Categories Integrating Kintsugi's API Migrating from Avalara/TaxJar to Kintsugi File Upload

API Guides

1. Planning An Integration 2. Product & Customer Records 3. Syncing Transaction Records 4. Handling Refund Transactions 5. Sales Tax Calculations

Advanced

API Lab

API Lab Calculate Tax for a Transaction Create a Product Managing Customers Creating Transactions Creating Credit Notes Managing Nexus

Documentation / 2026-07-21

PHP SDK isn't part of the 2026-07-21 release

This guide covers v1 only. The 2026-07-21 release has no equivalent.

Read it in v1 2026-07-21 getting started