GST: what sellers must have
Marketplaces collect tax at source, so a GST registration is effectively mandatory for selling on Amazon, Flipkart and every quick commerce platform, regardless of turnover. The legal name on GST must match the name used for the seller account, the bank account and the invoice.
If you place stock in warehouses in other states, whether through FBA, Flipkart Fulfilment or a quick commerce dark store network, you generally need GST registration in those states too. Plan state registrations before agreeing a multi city rollout.