You will be issued a receipt when you pay by credit card. How long it takes to issue the receipt depends on the method of return and the product. See below for details.
Return directly to an airport counter
You will be handed a receipt immediately after paying by credit card at the airport counter where you return the device.
However, only the service counters at Narita, Haneda, Chubu Centrair, Kansai International, and Fukuoka airports are able to process credit-card payments and issue receipts on the spot. (At service counters at other airports, your receipt will be issued within three (3) business days after you return the device and sent to you by email or postal mail.)
Returning in a Return Box or by courier delivery service
You will be sent a receipt by email or postal mail within three (3) business days after you return the device.
Products that take more time to issue a receipt
For JP-1, a product for use in Japan, charges are calculated based on call data maintained by the telecommunications carrier, so it takes about ten (10) days to finalize service charges. For this reason, the payment for this product will be processed and a receipt issued after finalization of your service charges, even when you have returned the device by one of the methods above. Your understanding is appreciated.