I have confirmed with IFS that Repeat media output in not supported for Interest Invoice for Apps8, so the PDF_Parameter_1 is not supported. Noting that I will have to hardcode the email address in the event.
Since each Customer has their own email address, hardcode is not an option.
Does anyone know of a way that I can pull in the AR Customer Contact detail, at least the E-mail Value into Event Action for Interest Invoice, so that the email notification and Interest Invoice pdf can be sent to the individual customer contact?