What to enter for action="https://YourServer/PathToExistingPaymentProcessingScript"

[knutroadie]

I'm attempting use the AcceptUI.js hosted form by copying and pasting the HTML code block provided by Authorize.net. The form relies on three variables to connect to an account: data-apiLoginID, data-clientKey, and an attribute in the hosted form called action, for which it reads action="https://YourServer/PathToExistingPaymentProcessingScript". I'm not sure what piece of information belongs there, and it's preventing me from using the form. Does anybody know what I should be doing here?!? Thanks in advance!