Two functions utilizing registration_errors filter

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I wrote two plugins that utilize the registration_errors filter: 

add_filter( 'registration_errors', 'process_payment', 10, 3 );

add_filter( 'registration_errors', 'add_user_to_SF', 10, 3 );

When add_user_to_SF returns errors, the process_payment function runs successfully (I know this because it processes a payment).

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How can I set this up so that when one of them returns an error the other doesn’t run and user registration doesn’t happen?

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  1. Identifying errors via error code

    Run add_user_to_SF with an earlier priority, to make it execute first

    add_filter( 'registration_errors', 'add_user_to_SF', 9, 3 );`

    Let’s assume you have two possible errors in your add_user_to_SF:

    function add_user_to_SF( $errors, $sanitized_user_login, $user_email )
{
    $has_errors = false;

    if ( /* some condition that should throw an error */ ) {
        $errors->add( 'some_error', 'some message' );
        $has_errors = true;
    }
    if ( /* another condition that should throw an error */ ) {
        $errors->add( 'another_error', 'another message' );
        $has_errors = true;
    }

    if ( ! $has_errors ) {
        /* write to your external DB */
    }

    return $errors;
}

    Then check for those errors in the latter function by using the $errors object’s get_error_codes method:

    function process_payment( $errors, $sanitized_user_login, $user_email )
{
    $error_codes = $errors->get_error_codes();

    if (
        is_array( $error_codes ) &&
        ! empty( $error_codes ) &&
        ! empty( array_intersect( array( 'some_error', 'another_error' ), $error_codes ) )
    ) {
        return $errors;
    } else {
        /* run your payment processing */
    }

    return $errors;
}

    Via a flag

    The following is a mock-up of how you’d do it with a flag as a class property:

    if ( ! class_exists( 'WPSE_96362_Registration_Errors' ) ) {
    class WPSE_96362_Registration_Errors
    {
        /* error flag */
        private $has_errors = false;

        /* constructor with filters */
        public function __construct()
        {
            /* earlier priority for "add_user_to_SF" method */
            add_filter( 'registration_errors', array( $this, 'add_user_to_SF' ), 9, 3 );
            add_filter( 'registration_errors', array( $this, 'process_payment' ), 10, 3 );
        }

        public function add_user_to_SF( $errors, $sanitized_user_login, $user_email )
        {
            if ( /* some condition that should throw an error */ ) {
                 $errors->add( 'some_error', 'some message' );
                 $this->has_errors = true;
            }
            if ( /* another condition that should throw an error */ ) {
                 $errors->add( 'another_error', 'another message' );
                 $this->has_errors = true;
            }

            if ( ! $this->has_errors ) {
                /* write to your external DB */
            }

            return $errors;
        }

        public function process_payment( $errors, $sanitized_user_login, $user_email )
        {
            if ( $this->has_errors ) {
                return $errors;
            } else {
                /* run your payment processing */
            }

            return $errors;
        }
    }
}

$wpse_96362_registration_errors = new WPSE_96362_Registration_Errors();