Need to send a formal receipt of payment

Need to send a formal receipt of payment

Hello,
our latest client has requested a formal receipt for a payment they made on one of our invoices.  I was surprised to realize that Zoho Invoice does not have this feature and there was not much discussion about this on the forums.
So what do people use to send payment receipts?
A receipt would include all of the information from the invoice as well as the date of the payment receipt and some language stating that fact.  There should be an option to "Send receipt to Client" when a payment is being added to the invoice.  Checking this option would automatically create a new receipt, email it to the client or create a pdf version, and save the new receipt with the related invoice for later review.
Please consider this feature for addition.

Thank you for the great tools.