Auto renew - will this work ?

I have a plan in CBSubs with yearly subscription. The subscription can be renewed manually by paying, but should also renew automatically if it has run out, and the user then buys a product on the site.
In an auto action i use the trigger joomla_onAfterPaymentSuccess - this triggers a renewal if [var1_total_amount] != 0 (free products do not give renewal) and if the subscription status is Expired or Unsubscriped.
I do not know if the last condition allready is changeed when the trigger for the auto action fires ? Then it is worthless.

but should also renew automatically if it has run out, and the user then buys a product on the site.

I'm sorry I'm not understanding what you mean by this. So they manually subscribe to Plan A, but if they buy Plan B (a product) then that also renews Plan A? Is that what you're trying to accomplish?

joomla_onAfterPaymentSuccess would be a Joomla event. So I've no clue what that extension that event even is for. I couldn't tell you what happens during that event.

I do not know if the last condition allready is changeed when the trigger for the auto action fires ? Then it is worthless.

The subscription conditions in CB Auto Actions are live checks. So it will check in the very moment that condition is ran the subscription status.

Sorry - I got confused myself. I think it works as it should. When a subscription has expired, then if a user buys a product through Events Calendar (thus the joomla trigger) - then the subscription is renewed.