Ok, my mistake was to no add "/DesktopModules/Hotcakes/API/rest/v1/" after "www.mywebsite.com", but it was not explained in any place.
[img=http://95.110.156.198/ForumImages/WhatsApp%20Image%202018-03-07%20at%2018.20.35.jpg]Iphone App[/img]
Now the problem is that the app crashes anything I click after login!
I've tried the App v.1.1 on HCC 3.0.1 and HCC 3.1.0
am I wrong something or is it the app that does not work?
Thanks

The version 3.0 and 3.0.1 release was largely outside of my control, so there are many things that went unchecked, including testing the extension points and the iPhone app. It sounds like there is something to be resolved with the iPhone app and/or Hotcakes itself. Would you mind creating an issue in GitHub with these great details so it can be fixed in the future? Thank you so much! :)

Issue added on Github: [url=https://github.com/HotcakesCommerce/app-ios/issues/1]https://github.com/HotcakesCommerce/app-ios/issues/1[/url]
Thanks

Thank you for that. I've responded to the issue and marked it as appropriate. This will be a huge help! :)