The captcha challenge delegate which will be called by the underlying framework when captcha challenge is required during the user registration.
-(IBAction)buttonsPressed:(UIButton*)button{[SMPUserManager setCaptchaChallengeDelegate:self];
SMPUserManager* userManager = [SMPUserManager initializeWithConnection:clientConn];}-(NSString*)didReceiveCaptchaChallenge:base64ImageString
{
// Return text String input from user.
}
               
            This is supported in case of SAP Mobile Platform, enterprise edition, cloud version onboarding only.