Vertex®O Series Online Commerce is a cloud-based tax solution that automates indirect tax determination and compliance for e-commerce, marketplace, and online platforms. It supports both direct-to-consumer and marketplace business models, enabling businesses to scale across jurisdictions without adding integration or operational complexity.

Tax compliance for e-commerce, marketplace, and online platforms is inherently complex. In addition to indirect tax obligations, businesses must manage platform-specific requirements that vary across jurisdictions. Cross-border operations add more complexity because each jurisdiction enforces its own tax rules, regulations, and reporting requirements.

Vertex O Series Cloud Online Commerce simplifies this complexity by automating tax determination across the checkout experience. A single solution supports both direct-to-consumer (two-party) and marketplace (three-party) transactions, helping businesses expand into new markets.

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

For more information, see: Getting Started with O Series Cloud Online Commerce

Online Commerce Features and Platforms

O Series Online Commerce includes access to these features and platforms:

Online Commerce feature	Online Commerce feature description
Customer Location Determination	Customer Location Determination enables tax calculation for digital goods, where the buyer’s location determines taxability, rather than the ship-from and ship-to addresses used for physical goods.
Liability Determination	Liability Determination is a tax-determination feature designed for marketplace transactions. It applies marketplace facilitator laws to determine whether the seller or the marketplace is responsible for collecting and remitting sales tax on a transaction.
Reporting Capabilities	Online Commerce Reporting provides centralized visibility into e-commerce transactions, tax liabilities, and compliance activities. Businesses can generate detailed transaction-level reports to support reconciliation, operational analysis, regulatory reporting, and audit readiness.
Vertex Invoice IQ	Vertex Invoice IQ is an API-based solution that automates the creation of tax-compliant digital invoices. It simplifies compliance with complex invoicing regulations by generating, delivering, and managing digital invoices that meet your business and regulatory requirements.
Vertex Validator	Vertex Validator is an API-based solution that automates validating tax identification numbers to support global indirect tax determination and compliance, helping with consistent tax treatment across e-commerce, marketplace, and online platforms.

For more information, see: Vertex O Series Online Commerce Supported Features

Authenticate Online Commerce

Vertex O Series Online Commerce uses O Series Cloud authentication to generate client credentials and access tokens.

To be authenticated and authorized to invoke the O Series APIs for Cloud deployments, you need to:

The access token can then be used to invoke the RESTful API.

See Authenticate O Series Cloud for detailed information and steps.

Online Commerce URIs

Use these base URIs for Vertex O Series Online Commerce:

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

Online Commerce APIs

These capabilities can be executed automatically as part of the tax determination workflow when calculating tax as a seller via the O Series Cloud Tax Calculation API :

Liability determinations
Customer location determination
Tax ID validation (with integrated Vertex Validator)
Digital invoice generation (with integrated Invoice IQ)

Vertex Validator and Vertex Invoice IQ also provide standalone APIs that can be called independently, allowing you to trigger validation and invoice intelligence processes outside of the automated tax determination and invoicing workflows.