Pick bKash QR or SSLCommerz QR when taking payment. A QR appears on the POS and on the customer display; the customer scans it and lands straight on your own gateway’s payment page. The moment the gateway confirms, the screen turns green and the sale is saved with the transaction ID — no typing TrxIDs, no screenshots to check.
The money goes to your own merchant account. The payment is verified with the gateway server-to-server and can be used for one sale only.