Add attributes to requests

Hello

I’m about to integrate a new roaming partner into our system which needs 
to be WISPr compliant.

Therefore I need the Location-ID and Location-Name attribute.

How can I rewrite the requests to add these attributes with an external 
script when a single hint is triggered?

We have more than 200 Hotspots/NAS with many more to come so I would 
like to pull data from an external script.

We have the unique NAS-Identifier – so how to I trigger an external 
script with the NAS-Identifier and then rewrite to add Location-ID and 
Location-Name to the request before it is sent to roaming partner 
through proxy.

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Best regards

Morten Winther
System & Application Architect