Debugging someone else's APK and getting the desired function.

There is an application that encrypts some parameters and sends it to the server. I have tried all decompilers, there is no such data. We need a person who can find a method for generating a token in the apk file. - (algorithm, parameters)

APK: 

https://www.apkmirror.com/apk/paypal-mobile/paypal-here/paypal-here-2-8-1-release/paypal-here-get-paid-anywhere-2-8-1-android- apk-download / download /

https://prnt.sc/10l5vg6    https://prnt.sc/10l6lb2
This authNonce token is constantly generating a new one. If you change it, the authorization will stop working. I need this hashing function in readable code !

The AuthNonce Is being sent in the POST Data and it changes every time.