There are 3 parameters that you need to specify for Authorized, Declined, and Error'd transactions. See the following lines in the code you pasted:
The OnSucessURL is for authorized transactions. When a card authorizes we forward the response to the specified page.
Please see the manual for details: http://manual.clickandpledge.com/For...rvice_Response
I hope that answers your question. Please let us know if we can be of more help.
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