aMember keeps it's own database and updates vBulletin's usergroups itself - nothing of your members cancellations/rebills/extensions is kept in the vBulletin system - and it doesn't query CCBill for it.
vBulletin uses a seperate (vBulletin Subscriptions) database that will basically be empty if you were using aMember.
I'm not 100% positive about this but I'm like 99% sure.
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