Use WooCommerce Advanced Messages with WooCommerce Subscriptions

gistfile1.php

<?php

/**
 * This code snippet adds a "Active Subscriber" Yes/No to the conditional box of WooCommerce Advanced Messages.
 * You can use this to display messages to customers with an active subscription.  
 */ 


/**
 * Add the option to the condition drop down
 * 
 * @param $conditions
 *
 * @return mixed
 */
function custom_wcam_conditions( $conditions ) {
	$conditions['User Details']['subscription'] = 'Active Subscriber';
	return $conditions;
}
add_filter( 'wcam_conditions', 'custom_wcam_conditions' );

/**
 * Add the options to the values drop down
 *
 * @param $values
 * @param $condition
 *
 * @return mixed
 */
function custom_wcam_values ( $values, $condition ){

	if ( 'subscription' == $condition ){

		$values['field'] = 'select';
		$values['options'] = array(
			'yes' 		=> __( 'Yes', 'woocommerce-advanced-messages' ),
			'no'	=> __( 'No', 'woocommerce-advanced-messages' ),
		);
	}
	return $values;
}
add_filter( 'wcam_values', 'custom_wcam_values', 10, 2);


/**
 * See if current user is a subscriber
 *
 * @param $match
 * @param $operator
 * @param $value
 *
 * @return bool
 */
function custom_wcam_match_condition_subscription( $match, $operator, $value ){

	if ( WC_Subscriptions_Manager::user_has_subscription(0, '', 'active')){

		return true;
	}

}
add_filter( 'wcam_match_condition_subscription', 'custom_wcam_match_condition_subscription', 10, 3 );