Update api_authentication.md

applications/crossbar/doc/api_authentication.md

@@ -4,7 +4,7 @@ Generating an auth token from your API token
 
 Use your account's API token to instruct Crossbar to create an authentication token to be used on subsequent requests requiring authentication.
 
-#### About API Authentication
+#### Getting your API key from the API (must already authenticate as a user):
 
 Get your API key for your account:
 
@@ -26,6 +26,18 @@ curl -v -X GET \
 }
 ```
 
+#### Getting the API Key from the database:
+
+Get your API key by requesting the account document directly from the database (through haproxy):
+```shell
+curl http://127.0.0.1:15984/accounts/{ACCOUNT_ID} 2> /dev/null | egrep -o '"pvt_api_key":"[0-9a-f]+"'
+```
+
+
+```
+"pvt_api_key":"{API_KEY}"
+```
+
 #### Schema
 
 Provides an auth-token via an Account API key