I want to get little bit idea

I am using 2checkout.i have use the redirect url for success message but how can i get the error message and what are the error message that can be occur after completion of all the requirements.

Thanks.

Are you not getting an error message (if it happens) back on the same URL?

I am not getting any error.I want to know which type of error can occur to which i show the error message.

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