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This would seem a job for session variables. Once your customer is created by your save function, you can grab the id and place it in a session variable for later reference.
if form.is_valid():
customer = form.save()
request.session['customer_id'] = customer.id
You can access this wherever you need, either as request.session['customer_id']
(or request.sessions.get('customer_id')
to return None if not set) in a functional view or self.request
as above in a class based view.
More info in the docs
Source:stackexchange.com