Updates for PTP events sub status codes

modules/cnf-fast-event-notifications-api-reference-v2.adoc

@@ -65,7 +65,7 @@ Returns a list of subscriptions. If subscriptions exist, a `200 OK` status code
 === Description
 
 Creates a new subscription for the required event by passing the appropriate payload.
-If a subscription is successfully created, or if it already exists, a `201 Created` status code is returned.
+
 You can subscribe to the following PTP events:
 
 * `sync-state` events
@@ -140,6 +140,27 @@ You can subscribe to the following PTP events:
 }
 ----
 
+The following subscription status events are possible:
+
+.PTP events REST API v2 subscription status codes
+[cols="1,2", width="90%", options="header"]
+|====
+|Status code
+|Description
+
+|`201 Created`
+|Indicates that the subscription is created
+
+|`400 Bad Request`
+|Indicates that the server could not process the request because it was malformed or invalid
+
+|`404 Not Found`
+|Indicates that the subscription resource is not available
+
+|`409 Conflict`
+|Indicates that the subscription already exists
+|====
+
 [discrete]
 === HTTP method