With Exp-resso Store, can I update a custom member field on checkout?
I'm working on an site for an academic society and I'm hoping to use Store and Freemember to manage membership dues. Suppose I set up a custom member field called Paid Through Date (YYYY-MM-DD). Assuming I require customer registration, can I sell a "2 year subscription" product and have that Paid Through Date get calculated and updated? Would I just do the date calculations in PHP and put submit a hidden input form input on checkout? Is
<input type="hidden"> even secure for POSTed data? If not, is there another way to track this "Paid Through" info for each member?
Adrian implies here that custom member fields (not just the mapped name/email/address info) can be updated at checkout when a product is purchased.