package Ġde . tele kom . sc qr login demo . callback Ċ Ċ import Ġde . tele kom . sc qr login demo . model . User Configuration Ċ Ċ interface ĠRetrieve Configuration Callback Ġ{ ĊĊĠĠĠ Ġfun Ġon Configuration Retrie ved ( configuration : ĠUser Configuration ?) ĊĊĠĠĠ Ġfun Ġon Failed To Retrieve Configuration () Ċ }