java.lang.NullPointerException: Attempt to invoke interface method 'int com.example.alpha.receiverserrvice.Services.Pay.pay(java.lang.String, java.lang.String, float)' on a null object reference

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Attempt to invoke interface method 'int com.example.alpha.receiverserrvice.Services.Pay.pay(java.lang.String, java.lang.String, float)' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'int com.example.alpha.receiverserrvice.Services.Pay.pay(java.lang.String, java.lang.String, float)' on a null object reference
at com.example.alpha.testpayservice.MainActivity$override.Payfor(MainActivity.java:47)
at com.example.alpha.testpayservice.MainActivity$override.access$dispatch(MainActivity.java)
at com.example.alpha.testpayservice.MainActivity.Payfor(MainActivity.java:0)
at com.example.alpha.testpayservice.MainActivity$1$override.onClick(MainActivity.java:40)
at com.example.alpha.testpayservice.MainActivity$1$override.access$dispatch(MainActivity.java)
at com.example.alpha.testpayservice.MainActivity$1.onClick(MainActivity.java:0)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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