HTTP methods

The following HTTP methods are used consistently throughout the Investment API.

HTTP method	Purpose
`GET`	Returns a list of resources or a single resource, depending on the call.
`POST`	Creates a new resource synchronously and returns `201 Created` or creates a new resource and starts the asynchronous processing required to complete the creation. In this case return code is `202 Accepted`.
`PATCH`	Updates a resource's information.
`DELETE`	Deletes an instance of a resource where allowed and returns `204 No Content`.