I need to send a receipt regarding a payment received against an invoice. How do I do that.

Hello, hvanzyl.

I can help you received an invoice payment in QuickBooks Online. You can use the Receive Payment option to mark the invoice as paid.

Here's how:

1. Click the + New in the panel and choose Receive Payment.
2. Choose a customer and select the invoice.
3. Hit Save and close.

I'm leaving you the resources below. This contains information on how to record multiple payments as well as handling foreign payments in QuickBooks Online. Also, this will provide you steps on how to record joint payments:

Record invoice payments in QuickBooks Online

Receiving and making payment for a foreign invoice/ bill with a foreign currency

Please let me know if you have any other questions. I'm always here to help and provide you additional assistance. You have a wonderful day!