> ## Documentation Index
> Fetch the complete documentation index at: https://spidocs.chargebee.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

# Tax Registration Number Validate SPI Integration

The **Tax Registration Number Validate Service Provider Interface (SPI)** enables seamless communication between Chargebee and external API platforms offering tax-related services.

You can refer the spec file for this spi [here](https://github.com/chargebee/cb-partner-spi/blob/main/spec/spi/openapi_trn.yml).

This SPI allows Chargebee to efficiently validate tax registration numbers for merchants, supporting both individual and batch validation processes.

This document provides a comprehensive overview for third-party users looking to integrate their API platforms with Chargebee's Tax Registration Number Validation Service, ensuring a secure and smooth validation experience for merchants within the Chargebee ecosystem.

## Key Services Provided

* **Individual Tax Registration Number Validation**: Validates the accuracy and legitimacy of tax registration numbers on a one-by-one basis.
* **Batch Tax Registration Number Validation**: Enabling bulk validation simplifies the validation process for merchants handling large datasets.

## Integrate your Tax Registration Number Validation Service Adapter App

To integrate your Tax Registration Number Validation Service Adapter App you can follow the App Onboarding process from [here](../../../app-onboarding/guide).