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Changelog

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

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January 2025

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v1.0.0 - Initial Release

Released: January 11, 2025

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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

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Authentication

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

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Developer Experience

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

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Upcoming Features

The following features are planned for future releases. Contact your account manager for early access.

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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

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API Improvements

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

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

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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

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Feedback

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

Developer Feedback

Send us your feature requests and feedback