syntax = "proto3"; package spotify.login5.v3.challenges; option java_package = "com.spotify.login5v3"; message CodeChallenge { enum Method { UNKNOWN = 0; SMS = 1; } .spotify.login5.v3.challenges.CodeChallenge.Method method = 1; int32 code_length = 2; int32 expires_in = 3; string canonical_phone_number = 4; } message CodeSolution { string code = 1; }