fields if $field is not a direct match.
				$nested_fields = explode( '.', $field );
				// A nested field is included so long as its top-level property
				// is present in the schema.
				if ( in_array( $nested_fields[0], $fields, true ) ) {
					$response_fields[] = $field;
				}
				return $response_fields;
			},
			array()
		);
		return $this->_fields;
	}

	/**
	 * Limit the contents of the meta_data property based on certain request parameters.
	 *
	 * Note that if both `include_meta` and `exclude_meta` are present in the request,
	 * `include_meta` will take precedence.
	 *
	 * @param \WP_REST_Request $request   The request.
	 * @param array            $meta_data All of the meta data for an object.
	 *
	 * @return array
	 */
	protected function get_meta_data_for_response( $request, $meta_data ) {
		$fields = $this->get_fields_for_response( $request );
		if ( ! in_array( 'meta_data', $fields, true ) ) {
			return array();
		}

		$include = (array) $request['include_meta'];
		$exclude = (array) $request['exclude_meta'];

		if ( ! empty( $include ) ) {
			$meta_data = array_filter(
				$meta_data,
				function( WC_Meta_Data $item ) use ( $include ) {
					$data = $item->get_data();
					return in_array( $data['key'], $include, true );
				}
			);
		} elseif ( ! empty( $exclude ) ) {
			$meta_data = array_filter(
				$meta_data,
				function( WC_Meta_Data $item ) use ( $exclude ) {
					$data = $item->get_data();
					return ! in_array( $data['key'], $exclude, true );
				}
			);
		}

		// Ensure the array indexes are reset so it doesn't get converted to an object in JSON.
		return array_values( $meta_data );
	}
}