Kong Authentication to MT5 Services

I have configured and routed my MetaTrader 5 APIs through Kong API Gateway. However, when I attempt to call the APIs via Kong, I encounter an authentication error.

I can successfully call the MetaTrader 5 APIs only when I authenticate myself. I believe I need to authenticate the Kong API Gateway with MetaTrader 5. Is there a way to do this, perhaps by using plugins?

When I call for the Kong API, it gives error 400.

Please advise, and let me know if any further information is needed.