Fresh, deno deploy microservices and auth

Hi,

I want to design a Fresh frontend and api working with deno microservices and auth. My proposal is on the scheme.

Is it the best way to manage auth between microservices ?

In this case, microservices can be consume directly without passing by the gateway. Is there any security problem ?

Could subhosting be an answer to isolate microservices and share a unique kv database ?

Thx for your opinions, feedback or insight