How to config Stripe Payment in Palm?

Thanks for the hints and links, plugin is clear now.
How to assure correct configuration of my {your_ecommerce_host}?
-for my site url in a form https://ecommerce.mylms.example.com shows page with login button and “Server Error”. Looks like something with the user, when I’m trying to create (or re-use an existing LMS user)
tutor local run ecommerce ./manage.py createsuperuser
getting error:
django.db.utils.OperationalError: (1045, "Access denied for user ‘ecommerce’@'1…

I found that others have similar issue too - Tutor E-Commerce: Server error - #2 by Ievgenii_Vasiuk