added callback for closing payment window

bKash-developer / pgw-merchant-backend-php

Demo merchant back-end for bKash pgw integration in php

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added callback for closing payment window #8

Closed itsourov closed 1 year ago

itsourov commented 1 year ago

Many developers including me faced this issue when we used the example code from this repo there was an error showing in the console when the user is closing the payment window. added the missing callback.