private function scrape_certificate( $certificate_id ) {

		// Create a nonce for getting the export HTML.
		$token = wp_generate_password( 32, false );
		update_post_meta( $certificate_id, '_llms_auth_nonce', $token );

		/**
		 * Modify the URL used to scrape the HTML of a certificate in preparation for a certificate export.
		 *
		 * @since 3.18.0
		 *
		 * @param string $url            Certificate permalink with a one-time use authorization token appended as a query string variable.
		 * @param int    $certificate_id WP_Post ID of the earned certificate (an "llms_my_certificate" post).
		 */
		$url = apply_filters(
			'llms_get_certificate_export_html_url',
			add_query_arg(
				'_llms_cert_auth',
				$token,
				get_permalink( $certificate_id )
			),
			$certificate_id
		);

		// Perform the request.
		$req = wp_safe_remote_get(
			$url,
			array(
				'sslverify' => false,
			)
		);

		// Delete the token after the request.
		delete_post_meta( $certificate_id, '_llms_auth_nonce', $token );

		// Error.
		if ( is_wp_error( $req ) ) {
			return $req;
		}

		return wp_remote_retrieve_body( $req );

	}