The «AlphaHPP» → «Paypage Request Reference» → «Request a Paypage Session» parameters table use different verbs in the SuccessURL and CancelURL descriptions:
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SuccessURL: Allows the merchant to define a different URL the response should be sent to from the default configured URL, for example for mobile support -
CancelURL: Allows the merchant to define a URL that is redirected to for unsuccessful transactions.

So, whether a customer is redirected to SuccessURL or not?