we have a php online shop which is similar to below:
[url removed, login to view]
we have to preselect the number of units in the "Additional" column.
As we do not have source code for the online shop, we have to do this by manipulating the session variables first in that php session and redirect customer to that session. so variables get preselected when user view the session.
The task is to write that php script that manipulates that php session.
Note that we do not are not modifying the online shop itself, the script is a completely separate script which probably need to do curl POST to modify the variables in the session of another program.