How to log in via nopCommerc API

Hello,

I am testing API PLUGIN with Ionic , I have successfully get a token and use it in the get & post methods, لاut I'm stuck in the login process

How I can use a nopCommerce customer credential to log in through the API ?

Just clarifying - Are you trying to login from one site and would like to keep the login session maintained in other domain?

For testing I have nopcommerce with API plugin running in my localhost  and I am trying to make order in nopcommerce through mobile application , for that purpose I need to validate the credintail of the customer from the mobile app UI against nopcommerce website, and then keep or maintain the customer Identity in the app.
The doc. Of API plugin - with many many thanks - explain everything, but for until the moment I haven't find any resource that cover this login process.

Anybody managed to login successfully through the API plugin ?