Tuan and Geoff,
As I'm interested in this thread and it's content, I hope it's ok to add my thought here and that Geoff doesn't mind either?
If we say for e.g. there's 2 plans created, one totally free which is actually the joomla access level a newly registered user is placed in to upon registration; this we will call for this example as Plan A. This is also set to a lifetime subscription. (Unless it is banned / blocked by site owner etc)
They then, are able to choose Plan B which is a paid for subscription and runs for 12 months. However, at the end of the 12 months said client / user doesn't renew their PAID subscription and in the subscription plans "Joomla Group Settings" tab of the paid plan there's 3 sections 'Assign to Joomla Groups", "Assign to Joomla Groups when Subscription Expired" and "Remove from Joomla Groups".
If we look at the "Assign to Joomla Groups when subscription expired" it says that it's for "Choose the Joomla Groups you want to assign subscribers to when their subscription for this plan is expired".
Therefore, couldn't this be where an up to that point paying subscriber of Plan B, who doesn't renew is then "demoted" to the "lifetime free subscription plan B" at this point. This in effect keeps them in a "live subscription plan" within the system; albeit it at a base free one and then can't the "Upgrade" element that Geoff is talking of, be offered to Plan B or any further created plans?
Maybe I'm reading it wrong but isn't the above already available if setup in the way I detail above? If it isn't, I can't imagine it being difficult for you to add to the extension, as it seems the majority is already there.
Just thought I'd share my thoughts and I hope both of you don't mind.
Regards,
