Use the service name as the part of key, when opening the subscription:
{ "ID": 2, "Domain": "MarketPrice", "Key": { "Name": "IBM.N", "Service": "IDN_SELECTFEED" }, "Streaming": true}
It's mildly annoying that the "Service" field isn't there in the sample code, even commented out.
Many thanks - would it be possible to have "Key"=>"Service" and "Key"=>"ServiceId" added to the docs?
@Gurpreet I notice you also using the "Streaming" field - can that be added also?
These and dozens of other fields are documented in the EWA developer guide available here.
See the description of Request message structure in Table 12.