Hi @Olu.
No, these are not related to Portal Developer APIs - Incorrect Docs - #2 by Olu,
but are related to Unable to List All Key Requests in Portal Management - #4 by selvamp.
All the above mentioned APIs return a 500 (Internal Server Error) - Application Error.
I suspect that maybe my request has some issues. I can’t confirm the same as I’m unable to figure out certain APIs from Tyk Docs. I hope this sets a context for you. I really appreciate your help 
You may also note that not only am I facing this issue on my On-Prem version of Tyk but also on Tyk Cloud version. All the same APIs return with a 500 Status Code (Application Error).
Regards,
Prashanth