If the user authentication screen expires, it will be redirected to a URL without apiKey and responseToken as below.
https://<redirect url>
At that time, please reacquire the user authorization URL.
PayPay for Developers FAQ
If the user authentication screen expires, it will be redirected to a URL without apiKey and responseToken as below.
https://<redirect url>
At that time, please reacquire the user authorization URL.