API Documentation

Use the Zamp API to calculate taxes on transactions and commit them for filing.

Getting started

Your account is pre-configured to calculate taxes based your specific sales tax situation. To get a Zamp API token, please send us a note here.

Learn how to authenticate your API requests with Zamp.

Understand how to work with paginated responses.

Find the right taxability rules to apply to your products.

Read about the different types of errors returned by the API.

Learn about calculating tax liability on transactions in real-time.

Learn about accessing and persisting transactions for filing.

Learn about validating addresses for more accurate tax calculations.