How to show server side errors in reactive forms

[Question]

I am trying so send some information to server which returns some errors for validation, lets say validity of the card.
I now want to use error-tailor to show those once my API call is completed.

I tried to set a behavior in this stackblitz example.
https://stackblitz.com/edit/error-tailor-example-f92cpr?file=src/app/app.component.html
