Paid Subscriptions question

[Crapin]

Hello

I'm trying to implement OneBip payment system into my forums, however I am not exactly sure how the Paid Subscription system operates.

I've gotten the entire system to operate correctly, however, I don't know exactly how the vBulletin timer operates when it comes to a subscription expiring.

For example, this is my query that I insert into the subscriptionlog:

INSERT INTO subscriptionlog (subscriptionid,userid,pusergroupid,status,regdate,expirydate) VALUES(1,$customerid,2,1,UNIX_TIMESTAMP(),(UNIX_TIMESTAMP()+2592000));

And then, I set the user's usergroupid to whatever is needed.

Now, after the 30 days (which is the 2592000 seconds), will vBulletin automatically take care of putting the user back to his old userrgroup (pusergroupid), or do I have to do this automatically?