Offer to send a copy of the receipt by mail, email, or fax-inquira - news1013 when you take a payment over the phone, offer the confirmation number so the customer can write it down.if they arent able to write it down (theyre in the car, etc.), ask for an email address so that you can email the confirmation to them.if they dont want an email, offer to fax it. if they dont want a fax, offer to mail it. the expectation is still to offer the number, but by offering it verbally. you only need to email, fax or mail when the customer doesnt want the confirmation number verbally.