How do we know that Paul saw the resurrected Christ?

In 1 Corinthians 15:8, Paul explains that he encountered the risen Christ, asserting his unique position as an apostle. This encounter happened on the road to Damascus (Acts 9) and is a central aspect of his testimony. Paul designates himself as 'one born out of due time,' indicating that unlike the other apostles who followed Jesus during His earthly ministry, Paul's apostolic calling came after Christ's resurrection. This divine encounter not only validated his apostleship but also underscored the role of grace in his life, transforming him from a persecutor to a proclaimer of the gospel.