What does it mean that Paul was an apostle of Jesus Christ?

Paul identifying himself as 'an apostle of Jesus Christ' indicates his role as a divinely appointed messenger through which God communicated His will. In 1 Corinthians 15:8-9, Paul reflects on his unique calling to apostleship, emphasizing that he received this role through divine revelation rather than human institutions. This underscores the conviction that his teachings are authoritative and rooted in first-hand encounters and instructions from Christ. Therefore, Paul's apostleship not only signifies his designation but also reinforces the credibility of the message he delivered.