Once the query done on the user's document, individual documents can be retrieved by using the id previously obtained in the DocumentReference resource.
With the webservice /Binary/, a GET request to the following URL structure will give you the document in the response.

https://api.qa.brusafe.be/mhd/Binary/1.3.6.1.4.1.12559.11.26.4.2.1193

where 1.3.6.1.4.1.12559.11.26.4.2.1193 is the ID found in the DocumentReference resource

The document retrieved will be in the format CDA as described above.