Generally it is a menu driven process. In order to process cashback benefits, the merchant has to get the brand mapped to his terminal beforehand.
Then he has to select the brand from available menu options which may drill down to subcategories and then the final product. After that, you input the serial number or Imei number and the emi tenure.
After a successful transaction, the chargeslip which comes out contains all details of the transaction.
The process may differ from brand to brand.
Thanks,