Go Manage receivable activities
Create activity with type refund as below

Go to setup manager approval limits
Setup approval limit for the user who will be initiating the refund. For multiple currencies add row for each currency
Select document type as credit memo refund

Go to recieveables billing and create transaction

Create transaction with type of credit memo and enter the negative amount

Mark the transaction complete and account the credit memo

Go to account received area > Click on task > Select manage credit number application

Search the credit promotion issue refund

Will the necessary payment details in the killer box and click on submit

Invoice will be created in payable as below

Invoice will be created with type payment request

Required payment details and issue the refund to the customer.

Payment is created for the customer
