Automate data gathering under amazon incognito


I’m using a web app generating data. They do not really offer an API but their web version implement it someway. It’s authenticated from my username/password into an Amazon incognito service. From that the web app received an authToken used in various API calls to get data.

I’d like to use postman monitor to get data on a a scheduled basis. But i can’t automate the Incognito part. Any help?

Once i’ve the token, it should be fine.

Seems the Auth sequence is : Get Auth, Get responseChalenge, GetUser with token
I found an incognito prerequest script but coudnt’t make it work for the purpose

The web site is:
You can create an account.

Thanks in advance