def buyer
      response = JSON.parse(@client.get("items/#{send(:id)}/buyers").body)
      Promisepay::User.new(@client, response['users'])
    end
def buyer
      response = JSON.parse(@client.get("items/#{send(:id)}/buyers").body)
      Promisepay::User.new(@client, response['users'])
    end
Show the buyer detail for a single item for a marketplace.

 @see https://reference.promisepay.com/#show-item-buyer

 @return [Promisepay::User]