How to add a custom flow service to be invoked in request processing

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1

im trying to add one of my custom services to run before every API call,
and im trying to add it using “invoke webMethods IS” in request processing in API Gateway.
how can i add the custom service, and where .

2

This should help you (link), unless I’m not following your “how can i add the custom service, and where”.
I don’t have an environment to provide a screenshot of the Policy tab, but perhaps someone else can.

KM