GST Verification
Retrieve the primary registered email and mobile number linked to a GSTIN.
Overview
What the GST to Contact API does
The GST to Contact API returns the primary contact details — email and mobile number — registered against a GSTIN. It helps onboarding and fraud teams confirm that a business's stated contact information matches its official GST registry record before activating an account.
Inputs
- Gstin
- Consent artefact id
Returns
- Registered email
- Registered mobile
- Entity name
- Match status
POST /v1/gst/gst-to-contact
How it works
Three steps to a verified result
Submit the GSTIN
Submit the GSTIN with a valid consent artefact.
FinHub retrieves the
FinHub retrieves the primary contact details registered against that GSTIN from GST registry data.
A masked email
A masked email and mobile number are returned, with the request logged to a tamper-evident audit trail.
Use cases
Where teams use GST to Contact
- Confirming stated business contact details against GST registry records
- Fraud screening for onboarding forms with mismatched contact information
- Re-establishing contact with a registered entity for collections or renewals
- Validating merchant contact data before payout activation
FAQ
GST to Contact API — FAQs
Common questions about FinHub's GST to Contact API.
FinHub returns masked email and mobile values by default to limit exposure of personal data, in line with DPDP principles.
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