You can use PayPay Balance and PayPay Credit for payment. During your first payment, you will link the online shop opening service "BASE" with your PayPay account. For details, please refer to the PayPay Official Guide.
d-Barai
You can pay together with your mobile docomo's phone charges or from your d-Barai balance. Also, you can earn and use d-points. Post pay fees : ¥300
au Simple Payment (au payment service)
It is able to pay for goods and services purchased via smartphone or PC together with monthly phone bill of au. Click here for more details. Post pay fees : ¥300