Ahh, I see.
There is no possibility to register custom attributes on a per-clientID basis. In Apigee, the closest you can come to that, is to attach custom attributes to the "Developer app" entity. This developer app may have multiple Client IDs. Normally people use multiple clientIDs only in support of key rotation, and so the assumption that "developer app = client" holds, and using the developer app to store the custom attributes is appropriate. I understand that you are saying that this approach is not suitable for your purposes. In other words, the assumption that "developer app = client" does not hold for you.
One possible way to work around this is to use a custom attribute with a name that embeds the client id in question. So imagine that the developer app has two client IDs: ABCDEFG and also XYZREMHS . Then, set custom attributes in the developer app which are "iprange-ABCDEFG" and "iprange-XYZREMHS" . Then you can use AssignMessage to load the correct IP range into a different variable. Like this:
<AssignMessage name='AM-Get-IP-Range'>
<AssignVariable>
<Name>var-containing-var-name</Name>
<Template>developer.app.iprange-{clientid}</Template>
</AssignVariable>
<!-- at this point, var-containing-var-name holds something like
developer.app.iprange-ABCDEFG -->
<AssignVariable>
<Name>variable-containing-ip-range</Name>
<Template>{var-containing-var-name}</Template>
</AssignVariable>
<!-- at this point, variable-containing-ip-range now holds the IP range that
was stored as a custom attribute on the developer app -->
</AssignMessage>
Another option is to store a JSON hash as a single custom attribute, maybe named "iprange". The value of that custom attribute might look like this:
{
"ABCDEFG" : "216.14.172.0" ,
"XYZREMOHS" : "174.53.128.0",
...
}
and use a JSONPath within AssignMessage to extract the appropriate IP range for your particular client ID. Similar idea to the above, but it uses the static JSONPath function to get the value. Something like this:
<AssignMessage name='AM-Get-IP-Range'>
<AssignVariable>
<Name>jsonpath1</Name>
<Template>$.{clientid}</Template>
</AssignVariable>
<!-- at this point, jsonpath1 holds something like
$.ABCDEFG -->
<AssignVariable>
<Name>variable-containing-ip-range</Name>
<Template>{jsonPath(jsonpath1,developer.app.iprange)}</Template>
</AssignVariable>
<!-- at this point, variable-containing-ip-range now holds the IP range that
was stored as a custom attribute on the developer app -->
</AssignMessage>
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