All of the payments you receive are securely created and processed in your Stripe Account that you set up when you activated payments in coapp.
In order to be able the manually refund a payment you need to have access to that Stripe account.
To refund a paid invoice by creating a credit note, follow these steps:
Navigate to Billing > Invoices from the Dashboard
Find and select the paid invoice you want to refund
On the invoice details page, click the overflow menu (⋯)
Select the option to create a credit note
Choose which line items to credit:
Discount a fixed amount from an invoice line item
Discount a quantity from an invoice line item
Add a custom discount line item with a description, quantity, and unit price
Specify how to apply the credit note for the paid invoice:
Create a refund: Refund the invoice's charge back to the customer's payment method
Link a refund: Link an existing refund for the invoice's charge
Credit the customer credit balance: Credit the customer's balance, which automatically applies to their future invoices
Credit outside of Stripe: Credit the invoice for an amount made in an adjustment outside of Stripe (such as cash or cheque)
Review the credit note details and confirm
Important notes:
When you create a credit note with a refund amount, Stripe attempts to refund the invoice's most recent payment
The sum of all credit notes issued for an invoice can't exceed the total amount of the invoice
For paid invoices, the sum of the refund, credit, and out-of-band payment amounts must equal the credit note total
Credit notes aren't modifiable once issued, but you can create multiple credit notes per invoice