This simple ocmod patch fixes the “Log in with PayPal” bug for OC v2.0.0.0 to 2.1.0.2.

Use this if you are having problems with the official built-in “Login with PayPal” module despite correct “Client ID/Secret and Return URL” and if you are redirected to a “blank page” after an attempted login.

Fixes:
[error] => invalid_authz_code
[error_description] => Authorization Code is invalid


Note! This patch will not be needed for upcoming OC releases (newer than OC 2.1.0.2+)

credit to "rossual" for fixing and troubleshooting this issue.

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Detailed instructions on how to setup the “Log in with PayPal” module:

GitHub - Log In with PayPal Wiki

Benefits of using the OC built-in “Login with PayPal” module:
* Decrease Login/Checkout/Register time
* Access over 130 Million PayPal users
* Leverage PayPal's Trusted Name