If someone is called by God to be an apostle, what is the proper way for them to convince others that their calling is genuine?

If person X is called by God to be an apostle, what should person X do next in order to convince others that their calling is genuine? What kind of evidence should person X provide to an audience of fellow Christians with a healthy dose of skepticism so that they may be fully assured that person X's calling to apostleship is from God and authentic? Worded in another way: if someone comes to me and tells me that they were called by God to be an apostle, what kind of evidence should I demand or look for to either verify or reject their claim? Since this is probably a controversial question, I would like to narrow the scope to Christians who are open to this possibility in the first place, that is, Christians who adhere to [Continuationism](https://en.wikipedia.org/wiki/Cessationism_versus_continuationism) .