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✏️ Editing: SuccessMessage.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Class NF_Action_SuccessMessage
 */
final class NF_Actions_SuccessMessage extends NF_Abstracts_Action
{
    /**
    * @var string
    */
    protected $_name  = 'successmessage';

/**
    * @var array
    */
    protected $_tags = array();

/**
    * @var string
    */
    protected $_timing = 'late';

/**
    * @var int
    */
    protected $_priority = 10;

/**
    * Constructor
    */
    public function __construct()
    {
        parent::__construct();

$this->_nicename = __( 'Success Message', 'ninja-forms' );

$settings = Ninja_Forms::config( 'ActionSuccessMessageSettings' );

$this->_settings = array_merge( $this->_settings, $settings );

add_action( 'nf_before_import_form', array( $this, 'import_form_action_success_message' ), 11 );
    }

/*
    * PUBLIC METHODS
    */

public function save( $action_settings )
    {

}

public function process( $action_settings, $form_id, $data )
    {
        if( isset( $action_settings[ 'success_msg' ] ) ) {

if( ! isset( $data[ 'actions' ] ) || ! isset( $data[ 'actions' ][ 'success_message' ] ) ) {
                $data[ 'actions' ][ 'success_message' ] = '';
            }

ob_start();
            do_shortcode( $action_settings['success_msg'] );
            $ob = ob_get_clean();

if( $ob ) {
                $data[ 'debug' ][ 'console' ][] = sprintf( __( 'Shortcodes should return and not echo, see: %s', 'ninja-forms' ), 'https://codex.wordpress.org/Shortcode_API#Output' );
                $data['actions']['success_message'] .= $action_settings['success_msg'];
            } else {
                $message = do_shortcode( $action_settings['success_msg'] );
                $data['actions']['success_message'] .= wpautop( $message );
            }
        }

return $data;
    }

public function import_form_action_success_message( $import )
    {
        if( ! isset( $import[ 'actions' ] ) ) return $import;

foreach( $import[ 'actions' ] as &$action ){

if( 'success_message' == $action[ 'type' ] ){

$action[ 'type' ] = 'successmessage';
            }
        }

return $import;
    }
}

MR SKB