/**
     * Gets user ID from contact ID
     *
     * @access public
     * @return int User ID
     */

    public function get_user_id( $contact_id ) {

        do_action( 'wpf_get_user_id_start', $contact_id );

        $user_id = apply_filters( 'wpf_user_id', false, $contact_id );

        if ( false !== $user_id ) {
            return $user_id; // Allow bypassing the database query
        }

        $users = get_users(
            array(
                'meta_key'   => wp_fusion()->crm->slug . '_contact_id',
                'meta_value' => $contact_id,
                'fields'     => array( 'ID' ),
            )
        );

        if ( ! empty( $users ) ) {
            return apply_filters( 'wpf_user_id', $users[0]->ID, $contact_id );
        } else {
            return false;
        }

    }