APIs used for Integration

Use case → Reference	`command` / primary value
Collect payment (form post from browser, card/UPI/NB/etc. per mode) — Collect Payment API (Merchant Hosted Checkout)	Browser form `POST` to `_payment` with mode-specific fields (`pg`, `bankcode`, card/UPI params as applicable)
Verify a payment — Verify Payment API	`verify_payment`
Check transaction info — Check Action Status with PayU ID	`check_action_status`
Get transaction by txnid — Get Transaction Info API	`get_transaction_info`
Refund a transaction — Refund Transaction API	`cancel_refund_transaction`

Collect Payment endpoint: POST https://test.payu.in/_payment (test) · POST https://secure.payu.in/_payment (production)
hash on _payment: Base sequence matches hosted checkout; card and other modes can require extended / different sequences — follow the Merchant Hosted / mode-specific guides.
Post-service (command APIs) endpoint: POST https://info.payu.in/merchant/postservice.php?form=2
Post-service hash formula: sha512(key|command|var1|SALT)

EXAMPLE QUESTIONS