public function merge_content( $content = null, $load_reusable_blocks = false ) {

		$content = parent::merge_content( $content, $load_reusable_blocks );

		// Merge.
		$merge   = $this->get_merge_data();
		$content = str_replace( array_keys( $merge ), array_values( $merge ), $content );

		// Do shortcodes.
		add_filter( 'llms_user_info_shortcode_user_id', array( $this, 'get_user_id' ) );
		$content = do_shortcode( $content );
		remove_filter( 'llms_user_info_shortcode_user_id', array( $this, 'get_user_id' ) );

		// Preserve legacy functionality which wraps the post content in the HTML specified in the template file.
		$use_template = apply_filters_deprecated(
			'llms_certificate_use_legacy_template',
			array( false, $this ),
			'6.0.0',
			'', // There is no direct replacement.
			__( 'Loading custom HTML from the certificate template is deprecated. All HTML should be added to the certificate directly via the editor or applied via post content filters.', 'lifterlms' )
		);
		if ( $use_template ) {
			ob_start();
			llms_get_template(
				'certificates/template.php',
				array(
					'email_message' => $content,
					'title'         => $this->get( 'title' ),
					'image'         => $this->get( 'certificate_image' ),
				)
			);
			$content = ob_get_clean();
		}

		return $content;

	}