old_contents: """
  Amazon MWS Inventory Fulfillment API
  """
  from __future__ import absolute_import
  
  from ..mws import MWS
  from .. import utils
  from ..decorators import next_token_action
  
  
  class Inventory(MWS):
      """
      Amazon MWS Inventory Fulfillment API
  
      Docs:
      http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_Overview.html
      """
      URI = '/FulfillmentInventory/2010-10-01'
      VERSION = '2010-10-01'
      NAMESPACE = "{http://mws.amazonaws.com/FulfillmentInventory/2010-10-01}"
      NEXT_TOKEN_OPERATIONS = [
          'ListInventorySupply',
      ]
  
      @next_token_action('ListInventorySupply')
      def list_inventory_supply(self, skus=(), datetime_=None,
                                response_group='Basic', next_token=None):
          """
          Returns information on available inventory
  
          Pass `next_token` to call "ListInventorySupplyByNextToken" instead.
  
          Docs:
          http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_ListInventorySupply.html
          """
          data = {
              'Action': 'ListInventorySupply',
              'QueryStartDateTime': datetime_,
              'ResponseGroup': response_group,
          }
          data.update(utils.enumerate_param('SellerSkus.member.', skus))
          return self.make_request(data, "POST")
  
      def list_inventory_supply_by_next_token(self, token):
          """
          Alias for `list_inventory_supply(next_token=token)`
  
          Docs:
          http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_ListInventorySupplyByNextToken.html
          """
          return self.list_inventory_supply(next_token=token)
  
new_contents: """
  Amazon MWS Inventory Fulfillment API
  """
  from __future__ import absolute_import
  
  from ..mws import MWS
  from .. import utils
  from ..decorators import next_token_action
  
  
  class Inventory(MWS):
      """
      Amazon MWS Inventory Fulfillment API
  
      Docs:
      http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_Overview.html
      """
      URI = '/FulfillmentInventory/2010-10-01'
      VERSION = '2010-10-01'
      NAMESPACE = "{http://mws.amazonaws.com/FulfillmentInventory/2010-10-01}"
      NEXT_TOKEN_OPERATIONS = [
          'ListInventorySupply',
      ]
  
      @next_token_action('ListInventorySupply')
      def list_inventory_supply(self, skus=(), marketplace_id=None, datetime_=None,
                                response_group='Basic', next_token=None):
          """
          Returns information on available inventory
  
          Pass `next_token` to call "ListInventorySupplyByNextToken" instead.
  
          Docs:
          http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_ListInventorySupply.html
          """
          data = {
              'Action': 'ListInventorySupply',
              'QueryStartDateTime': datetime_,
              'ResponseGroup': response_group,
              'MerchantId': marketplace_id
          }
          data.update(utils.enumerate_param('SellerSkus.member.', skus))
          return self.make_request(data, "POST")
  
      def list_inventory_supply_by_next_token(self, token):
          """
          Alias for `list_inventory_supply(next_token=token)`
  
          Docs:
          http://docs.developer.amazonservices.com/en_US/fba_inventory/FBAInventory_ListInventorySupplyByNextToken.html
          """
          return self.list_inventory_supply(next_token=token)
  
subject: Add merchant id inventory (#17) (#18)