Although you can set up Email notifications to allow the submitters to receive a copy of their form with other information, you can also now send a separate Receipt email whenever a user is making a Payment on a form.

When setting up Payments there will be an option to Send Receipt:

You will be able to choose from any Email validated field on the form itself and will have a drop down list to choose from those fields:

Then the user will receive and email that looks like this:

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