Technically all Catholics are required to accept the Catholic doctrine of Purgatory, this would include all Eastern and Oriental Catholics. The councils have pronounced anathemas on any who reject this doctrine.
However, very little about Purgatory has been defined in council. Basically, we know that there is purifcation after death for those who die in the State of Grace but still need some sanctification. We know that the purification is not fun (it involves some kind of suffering)....
Well, the Catholic catechism as quoted in this thread clearly states that Catholics must
believe in a purifying fire, not just "some kind of suffering.". If this is meant only in a metaphorical sense, then why doesn't it say so?