Hi, In our Zope installation, I have implemented support for PayPal IPN via a Python Script. Now I am trying to reorganize the code so that we can support multiple payment processors. I want to implement one PaymentHandler class per payment processor and have a factory class that provides an instance of PaymentHandler depending upon the parameters submitted with the payment processor's request to Zope. However, I am having trouble determining how to implement this in Zope. I'm not sure if I should use a Zope Product/ZClass or if I should implement this via an external method. Regarding the former, is it true that an "instance" variable always refers to a variable tied to the particular instance of that product within a Zope folder? Can an instance variable be specific to the request that is being processed? For example, can the code parse a "customer ID" variable out of the request sent to Zope and retain that customer ID only for the duration of the request? Regarding the external method approach, I reorganized our code into an external method that instantiates a factory class. The factory class then creates an instance of the class appropriate to the request being processed. The external method called by Zope and the factory class are contained in the same module. The processor-specific class is contained in a separate module that is imported by the external method module containing the factory class. When the factory attempts to instantiate the processor-specific class, the following error is returned: NameError. global name 'payPalIPNHandler' is not defined. I have verified that class payPalIPNHandler does exist and that the case-sensitivity of the letters in the name are correct. Any advice or shedding of light will be appreciated. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.481 / Virus Database: 277 - Release Date: 5/13/2003