Contact Details by GST API
Fetch the mobile number and email address registered against a GST number, giving you verified contact details for a business you are onboarding.
What the Contact Details by GST API does
Contact Details by GST returns the mobile number and email address registered against a GSTIN.
These are the contact details the business gave the tax authority, which makes them more reliable than whatever appears on a website or was typed into your form. For merchant verification that difference matters.
Where teams use the Contact Details by GST API
Obtaining verified contact details for a merchant
Cross-checking declared contacts against GST records
Reaching a business through registered channels
Detecting mismatches in merchant onboarding
Frequently Asked Questions (FAQs)
Why trust these over declared details?
They were registered with the tax authority, which carries consequences for misstatement, unlike a form field.
What does a mismatch indicate?
The person onboarding may not be authorised to act for the business. Worth verifying before proceeding.
What consent applies?
These are business contact details, but treat them under your normal purpose limitation and use them only for legitimate business contact.
Related APIs
- GST Verification API Verify a GST number and retrieve the registered business name, address, status and registration details from GST records.
- Email Check API Verify an email address is legitimate and deliverable, filtering out disposable, invalid and undeliverable addresses before they enter your database.
- Fastag Lookup API Retrieve FASTag information for a vehicle, including tag status and the details registered against it, for vehicle verification and fleet onboarding.
- Mobile to Address API Retrieve address details linked to a mobile number, aggregated from telecom, utility and financial data sources, to prefill and verify customer addresses.
Start verifying with the Contact Details by GST API
Book a walkthrough and we will show the call, the response and how it fits your onboarding flow.
- One API key for every check
- Verified against official Indian records
- Built for onboarding at scale