from django.contrib.auth.backends import RemoteUserBackend

class ShopifyUserBackend(RemoteUserBackend):

    def authenticate(self, myshopify_domain = None, token = None, **kwargs):
        if not myshopify_domain or not token:
            return

        user = super(ShopifyUserBackend, self).authenticate(remote_user = myshopify_domain)
        if not user:
            return

        user.token = token
        user.save(update_fields = ['token'])
        return user
from django.contrib.auth.backends import RemoteUserBackend

class ShopUserBackend(RemoteUserBackend):

    def authenticate(self, myshopify_domain = None, token = None, **kwargs):
        if not myshopify_domain or not token:
            return

        user = super(ShopUserBackend, self).authenticate(remote_user = myshopify_domain)
        if not user:
            return

        user.token = token
        user.save(update_fields = ['token'])
        return user
Rename ShopifyUserBackend => ShopUserBackend