Paul’s witness include the miraculous powers of the Holy Spirit working through him.>>>>>>
He was his own witness on that.
He was also endorsed by all of the Apostles.>>>>
Chapter and verse?
It does not appear that he even met most of the apostles.
Looks like you yourself are most likely a member of a religious cult. Paul's miracles are documented in the Book of Acts, not just his own writings. It is also absurd to dismiss Paul's own testimony. His writings are the earliest writings of the New Testament. If the other Apostles thought he was a liar and that his claims were false, they would have said so, and there would have been division in the church between Paul and the Apostles early on. None exists.
It does not appear that he even met most of the apostles.
Paul met with the "Apostles and elders" of the church, at least John, Peter and James (maybe more) as we read in Acts 15. He also reports these three gave him the "right hand of fellowship" in Gal 2:9. Peter, in his epistle, endorses Paul's writings as holy scripture in 2 Peter 3.