Login via Mobile app and cerify via server PHP code how



in our ios app we are doing login with twitter and after that they send identifier on server
so server side we have to verify that identifier is valid or not and if valid than we have to fetch info of user

Please guide me step with code .

i am already using

but not able to get any solution getting below error
#21 (1) { [“errors”]=> array(1) { [0]=> object(stdClass)#23 (2) { [“message”]=> string(53) “Your credentials do not allow access to this resource” [“code”]=> int(220) } } }

Tank You