I'm trying to integrate Ebizmarts Sage Pay Suite CE and Aheadworks Advanced Newsletter (not the built in Magento newsletter).
We have both of these plugins on our Magento store. Users can subscribe to the newsletter either on registration or through their account page but when ticking the sign up box on the checkout page the user doesn't get added to the mailing list. After much trial and error and discussion with Aheadworks I think the error lies in the Ebzmarts section as disabling this extension allows customers to register for the newsletter at checkout.
Does any one have any experience integrating these plugins or any ideas about how to go about debugging this?