How long after a payment can it be reversed?

The eligibility for a payment reversal depends on the payment method. For UPI transactions, a refund request is typically eligible for up to 6 months from the date of the original transaction, according to Paytm for Business documentation. For failed or canceled UPI transactions, the reversal process usually takes a few hours to 3 working days, or 3-5 working days for standard refunds.