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

# Changelog

> API updates and changes

# Changelog

All notable changes to the TxnCheck API will be documented here.

## January 2025

### v1.0.0 - Initial Release

**Released:** January 11, 2025

#### New Features

* **UPI by Mobile** - Retrieve UPI VPAs linked to a mobile number
* **KYC by Mobile** - Fetch KYC data (name, PAN, masked Aadhaar, DOB)
* **VPA Chargeback Check** - Check VPAs against fraud blocklist
* **Full Check** - Comprehensive verification combining all methods
* **Bulk VPA Check** - Batch blocklist check for up to 100 VPAs
* **Request Status** - Poll for verification results
* **Webhooks** - Real-time result delivery with signature verification

#### Authentication

* API Key authentication via `X-API-Key` header
* Optional HMAC-SHA256 request signing
* IP whitelisting support

#### Developer Experience

* Asynchronous processing model
* Webhook notifications with retry logic
* Comprehensive error codes and messages
* Multi-language code examples

***

## Upcoming Features

<Info>
  The following features are planned for future releases. Contact your account manager for early access.
</Info>

### Planned Enhancements

* **Bank Account Verification** - Verify bank account number and IFSC
* **GST Verification** - Validate GSTIN and retrieve business details
* **Face Match** - AI-powered facial recognition for identity verification
* **PAN Verification** - Validate PAN and retrieve linked details
* **Aadhaar Verification** - OTP-based Aadhaar verification
* **SDK Libraries** - Official SDKs for Python, Node.js, PHP, and Go

### API Improvements

* Batch request endpoints for all verification methods
* Request cancellation support
* Enhanced rate limiting with burst allowances
* Request history and audit logs

***

## Versioning

The TxnCheck API uses semantic versioning:

* **Major version** (v1, v2): Breaking changes
* **Minor version**: New features, backward compatible
* **Patch version**: Bug fixes, backward compatible

The current API version is **v1**. The version is included in the URL path:

```
https://api.txncheck.com/api/v1/...
```

<Note>
  We maintain backward compatibility within major versions. Breaking changes will be introduced in new major versions with ample migration time.
</Note>

## Deprecation Policy

When deprecating endpoints or features:

1. **Announcement**: 90 days notice before deprecation
2. **Warning Headers**: Deprecation warnings in API responses
3. **Documentation**: Updated docs with migration guides
4. **Support**: Continued support during migration period

## Feedback

Have suggestions for the API? We'd love to hear from you:

<Card title="Developer Feedback" icon="envelope" href="https://app.txncheck.com">
  Send us your feature requests and feedback
</Card>