Hi,
There is the case where some payment providers like to have a response to the autoresponse they send (They assume they are sending their resposne to a webservice.) In NB_Store the original code just jumped in before DNN and responsed for it, in DNN6 the DNN jumps in after the autoresponse and hence you get a full page returned, not the response accepted code the payment provider is expecting. If the payment provider isn;t expecting a response you will be OK, but if it is you need to created a webservice to deal with the response to the payment provider....hence term "Notify Provider" I used to describe this webservice.
Dave.