Kindly ensure details submitted are accurate and correctly spelt as the same would be used for filing the invoice and retainer agreement.
You will receive two emails once the payment is done. One from Razorpay/Paypal and the other from firstname.lastname@example.org. The invoice details will be elaborately mentioned in the e-mail. These emails would be your payment confirmation proof.
All the payments made would receive an acknowledgment in few minutes.