Upgrade Membership Link Question

Hi, I'll try...

I have a free membership account (trial account) which has restricted access to a trial exam. This membership only lasts one day.

The trial account has joomla user groups: Registered and Taster Membership.

I generally send out a 20% discount coupon to encourage them to upgrade.

When they upgrade the transaction goes through fine, but they dont automatically get access to the full membership content. The full membership content has joomla groups: registered and subscriber.

Invariably I get an email from them to say they paid but cant see any of the learning material (restricted content), so I have to manually change their joomla groups to Registered/Subsrciber, and then everything is fine.

Its manageable but would be good to get it seemless if possible.

I hope thats a bit clearer Tuan

Many thanks, Ben