Get Response Message

Get Response Message Api by @farazpay 
#15

Merge pull request #13 from anandsiddharth/bug-fix-patch

minor fix

Merge pull request #11 from anandsiddharth/php7.1-support

Php7.1 support added

recive payment update

Update StatusCheckProvider.php

Removed override of response method

App Minor Fix

Generate Checksum and Verify Checksum implemented for App

Update composer.json