Every tax payer who wants to avail the facility of OTC payment (only for paying tax upto Rs. 10,000/- per challan), will access GSTN or generation of a challan through which payment is to be made. Upon creation of the draft challan, the taxpayer will fill in the details of the taxes that are to be paid. From the available payment options, the taxpayer would select option of cheque, DD or cash based payment. The name of the authorized bank and its location (city/town/village) where the instrument/cash is to be presented is required to be filled in necessarily. No outstation cheques are to be accepted except those which are payable at par at all branches of bank having presence at that location.The challan so generated will have a Unique Common Portal Identification Number (CPIN),assigned only when the challan is finally generated, that will help the portal and other authorities in identifying the challan. GSTN will inform the challan details including validity period to the CBS (Core Banking System) of the selected bank on a real time basis.