code: def update_subscription(self, *, subscription_id, credit_card_token):
          
          payload = {
              "creditCardToken": credit_card_token
          }
          fmt = 'subscriptions/{}'.format(subscription_id)
          return self.client._put(self.url + fmt, json=payload, headers=self.get_headers())
docs: Update information associated with the specified subscription. At the moment it is only possible
          to update the token of the credit card to which the charge of the subscription is made.
  
          Args:
              subscription_id: Identification of the subscription.
              credit_card_token:
  
          Returns: