Vertex delivers the service via Vertex O Series Cloud, as well as the O Series Cloud API and the O Series Online Commerce API endpoint, which integrates seamlessly with the core O Series Cloud REST API.

You can integrate directly with the service through the API endpoint. This option is designed for users who want to incorporate a standalone service into their checkout experience while maintaining control over the checkout process, API sequence, and payment methods.

You can use the API to integrate the service features with your e-commerce, marketplace, or online platform and manage marketplace or seller settings. Depending on the access token in use, you can securely calculate taxes in your own environment with commonly available API development and testing tools.

Supported platforms

Here's a list of supported products and services in this service:

Service	Includes	API details
Vertex O Series Online Commerce	Vertex Invoice IQ Vertex Validator	Calculate Tax as a Seller, Reporting API; Restrictions apply.
Vertex for e-Commerce	Vertex Invoice IQ Vertex Validator	Seller Transaction API; Restrictions apply.
Vertex for Marketplaces	Vertex Invoice IQ Vertex Validator	Sellers API, Marketplace Transaction API, Marketplace Transaction API, and Reporting API; Restrictions apply.
Vertex Invoice IQ	Integrated Vertex Invoice IQ Standalone Vertex Invoice IQ	Vertex Invoice IQ API; Restrictions apply.
Vertex Validator	Integrated Vertex Validator Standalone Vertex Validator	Vertex Validator API; Restrictions apply.

API authentication

Get a credential as described in Authentication and Access. Include the credential in your standard O Series Cloud authentication setup. For more information, see Authenticate O Series Cloud.

API integration

Use the following base URLs:

Environment	URL
Sandbox	`https://oseries-plus-api.sandbox.marketplace.taxamo.com`
Production	`https://oseries-plus-api.marketplace.taxamo.com`

Use the API request references and field references described in the Reference Guide.

Download OAS files

Download the Open API Specification (OAS) files in JSON format from the O Series Cloud REST API Reference.

Transaction processing

For more information, see Transaction Processing.

Transaction keys

For more information, see Transaction Keys.