Vertex delivers Vertex O Series Cloud Online Commerce via Vertex O Series Cloud and the API endpoint, which seamlessly integrates with the core Vertex O Series Cloud REST API. Our API endpoint uses the same data model as the standard O Series Cloud REST API, helping to ensure consistency, reliability, and streamlined adoption for existing customers.

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

Depending on the access token in use, you can securely calculate taxes against your own environments using commonly available API development and testing tools.

Supported platforms

Here's a list of supported products and services:

Service	Includes	API details
Vertex O Series Cloud Online Commerce	Vertex Invoice IQ Vertex Validator	Calculate Tax as a Seller; 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

Obtain 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`

Include tax calculation and tax number validation data in the Calculate Tax as a Seller request. Use the requests 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.

Requests

Here's a list of requests supported in the service:

Request	Description
Calculation API Requests	Use these tax calculation requests with the Tax Calculation and Tax GIS API.
Reporting API Requests	Use these reporting requests to integrate reports into your financial host system.
Vertex Invoice IQ API Requests	Use these requests for tax-compliant digital invoices in the invoicing service.
Vertex Validator API Requests	Use these requests to validate tax numbers in the validation service.

For more information, see the Reference Guide.