Andrews Alipay access, php as a callback server authentication signature error

Paypal Andrews php

I use Paypal Andrews access, now is the notify_uri php always reported for RSA signature verification fail error.

The figure is the Alipay transfer over.

Below is my server to verify the signature sign and notify_data access code

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Reply:
Really good
Reply:
Dude, I have encountered this problem, there is no solution? Has been testing the wrong sign.