how can we implement VerifyApiKey in request preflow?

[rajeshnimmadan]

getting error while executing the proxy with verify apikey,passed the key as both query param and

header but getting the following error.

{ 
 "fault": {
  "faultstring": "Invalid ApiKey for given resource",
  "detail": {"errorcode": "oauth.v2.InvalidApiKeyForGivenResource"}
 }
}

The policy looks like:

<VerifyAPIKey name="verifyAPIKey">
 <DisplayName>verifyAPIKey</DisplayName>
 <Properties/>
 <APIKey ref="request.queryparam.client_id"/>
</VerifyAPIKey>