This can occur due to several factors; here are some common examples.
| Category | Function / API | Cause(Example) |
| Payment | pp.render | ・Neither amount, merchantPaymentId, nor requestedAt is set. ・merchantTimeoutAt is set to 0 or a past value. |
| pp.createOrder | ||
| Login | pp.render | The domain for the redirectUrl is not registered with PayPay. Please contact your PayPay sales representative or the Smart Payment Onboarding team to register the domain. |
| pp.getLoginUrl | ||
| /v2/smartpayment/qr/sessions |
エラー error SmartPayment pp.render スマートペイメント pp.createOrder pp.getLoginUrl /v2/smsartpayment/qr/sessions BAD REQUEST