au PAY (in Japanese only) is a payment service that allows payment by QR code/bar code by setting up the au PAY App on your smartphone.
To distinguish it from other services, it may be written as au PAY (code payment).
The au PAY balance is the same for au PAY (code payment) and for au PAY Prepaid card (au WALLET Prepaid card).
The stores where it can be used are not the same as those for the au PAY Prepaid card (au WALLET Prepaid card).
au PAY Prepaid card (au WALLET Prepaid card) is for Mastercard affiliated stores (for online shopping it includes websites that support WebMoney)
au PAY (code payment) is limited to stores with the logos of au PAY or Rakuten Pay (app payment/some stores)
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