app/code/Magento/WebapiAsync/README.md
This module extends the Web API extension and provides functionality to process asynchronous requests.
This module handles asynchronous requests, schedules, publishes, and consumes bulk operations from a queue.
Before installing this module, note that this module is dependent on the following modules:
For information about enabling or disabling a module, see Enable or disable modules.
Code/ - the directory that contains Remote service reader configuration files.
For information about a typical file structure of a module, see Module file structure.
Extension developers can interact with this module. For more information about the extension mechanism, see Plugins.
The dependency injection mechanism enables you to override the functionality of this module.