Others on this thread have already supplied you with specific citations where Paul speaks of practicing penances.
I will readily admit that Saint Paul and I are members of the same Church, the Holy, Catholic, Apostolic Church of Rome, with Saint Peter and his successors as bishop of Rome at the head.
What they provided had no references to beating with a belt. But, the error of Rome is deep and wide. And the sheeple are ensnared in its web. We call on Rome to repent...if it can.