Start the game with

 launcher.exe -cheats

 During gameplay, bring up the console [~] and type in:

 GodModeCora 0/1        God Mode On/Off
 GiveMoney              Give Money to Player
 NoClipCora 0/1         No Clipping Mode On/Off
 BuyAllAccs             Buy All Accessories
 CheatRepairAllCarPart  ?
 CheatUseStamina        ?