What is the linkage between GSTN and the authorized Banks?

There will be real time two-way linkage between the GSTN and the Core Banking Solution (CBS) of the Bank. CPIN is automatically routed to the Bank via electronic string for verification and receiving payment and a challan identification number (CIN) is automatically sent by the Bank to the Common Portal confirming payment receipt. No manual intervention will be involved in the process by any one including bank cashier or teller or the tax payer.