docs: def retrieve(self, id) :
          """
          Retrieve a single deal
  
          Returns a single deal available to the user, according to the unique deal ID provided
          If the specified deal does not exist, the request will return an error
  
          :calls: ``get /deals/{id}``
          :param int id: Unique identifier of a Deal.
          :return: Dictionary that support attriubte-style access and represent Deal resource.
          :rtype: dict
          """
  
          _, _, deal = self.http_client.get("/deals/{id}".format(id=id))
          deal["value"] = Coercion.to_decimal(deal["value"])
          return deal