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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(self, request, **kwargs):
 		""" 		Return the customer's valid subscriptions. 		Returns with status code 200. 		"""

		customer, _created = Customer.get_or_create(
			subscriber=subscriber_request_callback(self.request)
		)

		serializer = SubscriptionSerializer(customer.subscription)
		return Response(serializer.data)