which type of grant type to use for access as admin token

which type of grant type is used for admin for requesting token in laravel application

{
   "username":"abc@example.com",
   "password":"abcdefghi",
   "client_id":2,
   "client_secret":"ASJHdsafgsjdhghjHJAG",
   "grant_type":"?"
 }

which grant_type of token gives me to access all users read and write operation .Thank You

via Chebli Mohamed