as $child_id => $child_download_data ) {
				$file_url = $parent_download_data['file'];

				$must_create_permission =
					// The variation offers the same file as the parent for download...
					in_array( $file_url, array_keys( $child_download_data['download_ids_by_file_url'] ), true ) &&
					// ...but no equivalent download permission (same file URL, order id and user id) exists.
					! array_key_exists( $parent_file_order_and_user, $child_download_data['permission_data_by_file_order_user'] );

				if ( $must_create_permission ) {
					// The new child download permission is a copy of the parent's,
					// but with the product and download ids changed to match those of the variation.
					$new_download_data                = $parent_download_data['data'];
					$new_download_data['product_id']  = $child_id;
					$new_download_data['download_id'] = $child_download_data['download_ids_by_file_url'][ $file_url ];
					$this->downloads_data_store->create_from_data( $new_download_data );
				}
			}
		}
	}

	/**
	 * Get the existing downloadable files and download permissions for a given product.
	 * The returned value is an array with two keys:
	 *
	 * - download_ids_by_file_url: an associative array of file url => download_id.
	 * - permission_data_by_file_order_user: an associative array where key is "file_url:customer_id:order_id" and value is the full permission data set.
	 *
	 * @param \WC_Product $product The product to get the downloadable files and permissions for.
	 * @return array[] Information about the downloadable files and permissions for the product.
	 */
	private function get_download_files_and_permissions( \WC_Product $product ) {
		$result    = array(
			'permission_data_by_file_order_user' => array(),
			'download_ids_by_file_url'           => array(),
		);
		$downloads = $product->get_downloads();
		foreach ( $downloads as $download ) {
			$result['download_ids_by_file_url'][ $download->get_file() ] = $download->get_id();
		}

		$permissions = $this->downloads_data_store->get_downloads( array( 'product_id' => $product->get_id() ) );
		foreach ( $permissions as $permission ) {
			$permission_data = (array) $permission->data;
			if ( array_key_exists( $permission_data['download_id'], $downloads ) ) {
				$file = $downloads[ $permission_data['download_id'] ]->get_file();
				$data = array(
					'file' => $file,
					'data' => (array) $permission->data,
				);
				$result['permission_data_by_file_order_user'][ "{$file}:{$permission_data['user_id']}:{$permission_data['order_id']}" ] = $data;
			}
		}

		return $result;
	}
}