I'm trying to work out the best way to integrate subscriptions into a website using Webpayments Standard.
The main issue is that we need to give members credit when they Refer-A-Friend so their subscription amounts will not be the same every year.
Since I can't vary a subscription directly I can generate a button that allows them to accept new terms, however that only allows me to specify a new recurring amount going forward perpetually (using the a3 variables) anything I put in a1 or a2 to create a new one-off period is ignored for a change of subscription, so I can't seem to create a new 'trial period' for one year with the discounted rate that reverts to the full rate afterwards. That only seems to work for a new subscription, not a modify.
This idea therefore suffers form two problems:
1) The member has to actively accept a change of subscription to claim their discount (which is a pain)
2) It changes it perpetually not just for the next year, so they'd then have to accept the uplifted one next year
This defeats the object of having a subscription in this case.
The only other option I can see is to issue a partial refund after their next subscription to credit them back the Refer-A-Friend discount they've earned for that year, but I'd need a way to do that under program control - I'm not going back manually to hundreds of members via the PayPal control panel to issue refunds.
Anyone know a better way to do it?
