function llms_get_certificate_content( $id = 0 ) {

	$content = '';

	$certificate = llms_get_certificate( $id, true );
	if ( $certificate ) {

		// If `$id` was empty to use the global, ensure an id is available in filter on the return.
		$id = $certificate->get( 'id' );

		// Get raw content because we filter it again below.
		$content = $certificate->get( 'content', true );
	}

	/** WordPress core filter documented at {@link https://developer.wordpress.org/reference/hooks/the_content/}. */
	$content = apply_filters( 'the_content', $content );

	// Get merged content for templates.
	if ( 'llms_certificate' === get_post_type( $id ) ) {
		$content = $certificate->merge_content( $content );
	}

	/**
	 * Filter the `post_content` of a certificate or certificate template.
	 *
	 * @since Unknown
	 * @since 6.0.0 Added the `$certificate` parameter.
	 *
	 * @param string                     $content     The certificate content.
	 * @param int                        $id          The ID of the certificate.
	 * @param bool|LLMS_User_Certificate $certificate Certificate object or `false` if the post couldn't be found.
	 */
	return apply_filters( 'lifterlms_certificate_content', $content, $id, $certificate );

}