POS application testing

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We have developed one application called "Flits" you can find it here App Link.

We have a feature called Store credit.Recently we develop integration with POS for that store credit to be used in POS(It is in beta version right now).

We are facing some issues related to that.

I am wondering that is there any easy way to debug POS integration currently there is no way to debug our POS code in mobile / iPad. 


So how we can test it effectively so that we can resolve our issues and improve our code.


Any suggestions will do work.

Thank you.