Verification in every state and union territory
Everything runs online and the sources are national, so the checks are the same wherever the person is. What differs from state to state is the GST code at the start of every GSTIN, which is the first thing to look at on a number a supplier gives you. Each state page has a checker that flags a GSTIN from somewhere else.
North
North East
South
The process is the same everywhere
The person consents on their own phone, checks run against national sources in under a minute, and the report says plainly what was and was not established.