Transaction Recording on POST only - any advice?

We have a product contains 2 proxies one of which is a POST, and one a GET. During the POST preflow the GET is called using the same apikey to verify the user is authorized for this POST. We created a package that has a rate plan that bills 1 cent per 200 OK request. When we make a request, however, this rate plan bills 2 cents. It seems to be billing for both calls that are made.
We tried disabling the authorization call out and indeed, the plan only billed one penny.
Question: how can I limit the tx recording policy so it only bills once, for the successful POST? I'm still digging but any help would be marvelous.
Thank you
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