A OTP now can be validated via REST service.

Config example:

    # Configuration for OTP managers
    otp_manager:
        name:                 orm
        managers:

            # ORM OTP configuration
            orm:                  []

            # HTTP OTP configuration
            http:

                # Active provider for HTTP OTP manager
                provider:             guzzle

                # Available HTTP providers
                providers:
                    guzzle:

                        # Guzzle client service id
                        client:               ~

                        # Url for fetch/invalidate OTPs
                        resource:             ~
Small changes in property names
Changes in guzzle provider
Synchronized rollback
Added support of failure_path