How does one reverse a payment?

Hello, lateef-abader-gm. 

I'm here to help you perform the steps to reverse the payment in QuickBooks Online.  If you're using QuickBooks Payments, the Reverse a Transaction feature can be done under your Merchant account. 

Here's how: 

1. Sign in to your QuickBooks Payments account.
2. Tick the Processing Tools drop-down and select Reverse a Transaction.
3. Fill out the necessary fields.
4. Tap Search.
5. Choose the transaction you want to refund.
6. Press Submit.

An alternate method to Reverse or Void a payment: 

1. Click the Activity & Reports drop-down and select Transactions.
2. Enter the date period.
3. Tap Search.
4. Choose the Transaction ID or the transaction you want to reverse.
5. Hit Reverse (Void/Credit).
6. Place a checkmark on the transaction.
7. Press Submit. 

For details, you can check out this guide: Void or refund transactions in QuickBooks Payments.

Stay in touch with me if you need anything else with QuickBooks. I'm always around to help you. Have a great day!