How do we know Paul's apostleship is true?

Paul's claim to apostleship is supported by his dramatic conversion experience on the road to Damascus, where he was directly addressed by Jesus Christ. As stated in Acts 9:15, God called him as a chosen vessel to bear His name before the Gentiles. This divine appointment, along with his extensive missionary work and theological contributions, serves as strong evidence of his apostleship. Moreover, his writings and teachings align with the Gospel and the doctrines established by the other apostles, confirming his role in the foundation of the church.