public function get_raw_data() {
		// @codingStandardsIgnoreStart
		// $HTTP_RAW_POST_DATA is deprecated on PHP 5.6.
		if ( function_exists( 'phpversion' ) && version_compare( phpversion(), '5.6', '>=' ) ) {
			return file_get_contents( 'php://input' );
		}

		global $HTTP_RAW_POST_DATA;

		// A bug in PHP < 5.2.2 makes $HTTP_RAW_POST_DATA not set by default,
		// but we can do it ourself.
		if ( ! isset( $HTTP_RAW_POST_DATA ) ) {
			$HTTP_RAW_POST_DATA = file_get_contents( 'php://input' );
		}

		return $HTTP_RAW_POST_DATA;
		// @codingStandardsIgnoreEnd
	}