API call from Portal to GW

Document ID : KB000125557
Last Modified Date : 31/01/2019
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Issue:
Is there any other function for Portal to directly call open APIs other than management API (such as portalman)? 
Or there are any invoke arbitrary API by operating Portal login user? 
Environment:
API Portal 4.2
Resolution:

The answer is  ‘No’ as there is no such documentation or relevant information.