PayU Gateway

Hello

I have a small problem with PayU gateway
It tests it with test payments, but the link that returns me PayU does not work
I have this message

404 Not Found
The request /index.php?option=com_payplans&gateway=payu&view=payment&task=complete&action=success&payment_key=8O56WJCMAUDY was not found on this server.

And the subscription is activated.
What could be wrong?

Is it possible to set this so that new users will not get to the joomla user base?

Regards
Leszek

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