code: def activate(self):
  		
  		obj = self.find_paypal_object()
  		if obj.state == enums.BillingPlanState.CREATED:
  			success = obj.activate()
  			if not success:
  				raise PaypalApiError("Failed to activate plan: %r" % (obj.error))
  		# Resync the updated data to the database
  		self.get_or_update_from_api_data(obj, always_sync=True)
  		return obj
docs: Activate an plan in a CREATED state.