Yes you can. When using the so called “custom variables” you can send extra information to Quickpay when doing an authorize or subscribe. The information will then be sent/saved and can be viewed on the callbackurl or in the Quickpay-manager.
Syntax: In the form for the payment window you just set a hidden field with “variables[variable]” to “$value”.
Below is an example and how it will be saved in the Quickpay-manager.
<form method="POST" action="https://payment.quickpay.net">
<input type="hidden" name="version" value="v10">
<input type="hidden" name="variables[name]" value="Peter Hansen">
<input type="hidden" name="variables[street]" value="Sønderallé 45">
The information can be seen under Payment variables in the given transaction.