return apply_filters(
		'llms_sales_page_types',
		array(
			'none'    => __( 'Display default course content', 'lifterlms' ),
			'content' => __( 'Show custom content', 'lifterlms' ),
			'page'    => __( 'Redirect to WordPress Page', 'lifterlms' ),
			'url'     => __( 'Redirect to custom URL', 'lifterlms' ),
		)
	);
}

/**
 * Get an array of available course/membership checkout redirection options
 *
 * @since    3.30.0
 * @version  3.30.0
 *
 * @param    string $product_type The product type, Course or Membership
 * @return   array
 */
function llms_get_checkout_redirection_types( $product_type = '' ) {

	$product_type = empty( $product_type ) ? __( 'Course/Membership', 'lifterlms' ) : $product_type;

	return apply_filters(
		'llms_checkout_redirection_types',
		array(
			'self' => sprintf( __( '(Default) Return to %s', 'lifterlms' ), $product_type ),
			'page' => __( 'Redirect to a WordPress Page', 'lifterlms' ),
			'url'  => __( 'Redirect to a custom URL', 'lifterlms' ),
		)
	);
}

/**
 * Add a "merge code" button that to auto-add merge codes to email & etc...
 *
 * @since 3.1.0
 * @since 3.17.4 Unknown.
 * @since 6.0.0 Move HTML into view file: `includes/admin/views/merge-code-editor-button.php`.
 *                Move certificate merge code list to `llms_get_certificate_merge_codes()`.
 *
 * @param string  $target Target to add the merge code to. Accepts the ID of a tinymce editor or a DOM ID (#element-id).
 * @param boolean $echo   If `true`, echos the HTML output.
 * @param array   $codes  Optional array of custom codes to pass in, otherwise the codes are determined
 *                        what is available for the post type.
 * @return string Returns the HTML for the merge code button.
 */
function llms_merge_code_button( $target = 'content', $echo = true, $codes = array() ) {

	$screen = get_current_screen();

	if ( ! $codes && $screen && isset( $screen->post_type ) ) {

		switch ( $screen->post_type ) {