Abstract VAT Validation vs API Reference: Billing
If you need a Finance API that's easy to integrate, go with Abstract VAT Validation.
Abstract VAT Validation
Validate VAT numbers and calculate VAT rates
API Reference: Billing
# Introduction Welcome to the reference for the Zuora Billing REST API! To learn about the common use cases of Zuora Billing REST APIs, check out the [API Guides](https://www.zuora.com/develope...
Abstract VAT Validation
- Simple API key authentication
- HTTPS supported
- CORS enabled for frontend use
API Reference: Billing
- Simple API key authentication
- HTTPS supported
| Feature | Abstract VAT Validation | API Reference: Billing |
|---|---|---|
| Authentication | apiKey | apiKey |
| HTTPS | Yes | Yes |
| CORS | Yes | Unknown |
When to use which?
Abstract VAT Validation works directly from the browser with CORS enabled, making it better for frontend-only apps.