Plugin developement

[tonibm19]

I'm trying to make /tpa, and integrate it into Core. For now, when you type /tpa and you have the core.tpa permision you send a request to other player, and when you do it, you recieve the message: teleport request send and the other player receives the message: Player has sent you a teleport request, type /tpaccept to accept it. The problem is that I don't know to make that if a player types /tpaccept, the player that has sent the request teleport to the other player. How can I do it?