You can email the confirmation page or receipt when processing a credit card, Dena3.
I'll guide you with the steps:
Although, if it's processed already, we can print the credit card receipt/payment, then manually email it to your customer. Here's how:
You can attach the PDF to your email, and send it to your customer.
Let me share the article about processing payments in the Merchant Service Center for future reference.
If you have more questions, please tag me and I'll reply to you as soon as I can.