This guide will let you know how you can play the Payback2 game with your friends.
The first thing you will need to do is to connect to the universal chat box and type any message. Then click on Play and tap multiplayer.
Head to Private and then go to settings in order to select the mode that you want to play.
After that, you will need to go to the Invite section. You will find a shortcode there, share that code with your friends. He will need to enter this code to join you in the game.
You can also ask your friend to share his shortcode with you. Once you get the code, go to Multiplayer, then Shortcode and enter the code to join the game.