Taxamo Seller Transaction API

The Taxamo Seller Transaction API Developer Hub

Welcome to the Taxamo Seller Transaction API developer hub. You'll find comprehensive guides and documentation to help you start working with Taxamo Seller Transaction API as quickly as possible, as well as support if you get stuck. Let's jump right in!

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Introduction to the Taxamo Assure service and the Seller Transaction API.

What is Taxamo Assure by Vertex?

You can use the Taxamo Assure by Vertex service to complete the following tasks:

  • Determine the party (seller, buyer, or Taxamo) who is liable for tax.
  • Calculate the tax rate.
  • Process refunds.
  • Generate invoices.

The service is intended for physical goods valued at €150 or below. For more information, see Taxamo Assure.

For more detailed information about how it works, see How Taxamo Assure Works.

What is the Seller Transaction API?

The service is based on the Seller Transaction API. This is a RESTful API that contains a set of endpoints for handling transactions, like sales and refunds.

The API facilitates the integration between Taxamo and your checkout processes and baskets.

The following table outlines an example of what this integration might look like. It is intended to show how your business processes can be mapped to the endpoints that you send requests to. These examples are simplified to give you a sense of how the API integration works:

Business Use Case

Transaction Stage


In your customers’ baskets, before they make a purchase.

Order storage

Store Transaction

In your customers baskets, after they confirm a purchase.

Order confirmation

Confirm Transaction

On refunds and refund processing

Refund transaction

Refund Transaction

On invoices


Where Taxamo is liable for VAT, an invoice is generated automatically for confirmed transactions and emailed to the buyer. Where Taxamo is not liable, an invoice link is provided in the API response. For more information, see Configuring Invoices.

For a more detailed overview of how the API works, see API Overview.

For more detailed information about how to configure the API, see Configuration Overview.

If you need further help, contact support at

Updated 14 days ago


Introduction to the Taxamo Assure service and the Seller Transaction API.

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