in auth-lib/src/main/java/com/spotify/sdk/android/auth/AuthorizationClient.java [398:407]
void authorize(AuthorizationRequest request) {
if (mAuthorizationPending) return;
mAuthorizationPending = true;
for (AuthorizationHandler authHandler : mAuthorizationHandlers) {
if (tryAuthorizationHandler(authHandler, request)) {
mCurrentHandler = authHandler;
break;
}
}
}