put https://public.billsby.com/api/v1/rest/core//invoices//Payment
This API request will reattempt a failed invoice payment on your customer's account.
You can also do this directly in the Billsby control panel by heading to 'Invoices and Credit notes' in the left hand menu and navigating to the Invoices page. You can search for the invoice you're looking for by customer name, customer email, customer ID or invoice number. Once you've found the correct credit note, you can reattempt the payment using the button provided.