Django login using custom backend
login/store-name

from django.contrib.auth import authenticate, login

def my_view(request):
    username = request.POST['username']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active  *** and user can login in this store ***:
            login(request, user)
            # Redirect to a success page.
        else:
            # Return a 'disabled account' error message
    else:
        # Return an 'invalid login' error message.

urlpatterns = patterns('',
    url(r'^login/store-name-1/$', login, name="login"),
    url(r'^login/store-name-2/$', login, name="login"),
    url(r'^accounts/logout/$', logout, {'next_page': '/',}, name='logout')
)