Integrate with EBay & Amazon?

Hi.
I have almost completed my ZC store. It will only sell downloadable PDF's. I will be integrating a 3rd party software (seta PDF stamper) into my store to watermark each file on the fly with customer details (name & email).
Ok, now my question/issue, I would also like to list my products on EBay and Amazon. Does anyone have any ideas as to how I can automate these additional sales to be watermark via my ZC store so that the eBay/Amazon customer can have their product delivered automagically with the aforementioned watermark?
I realise I could manually add each eBay customer to my ZC backend then download their product for them and forward it via email once I receive eBay confirmation of their order but that isn't the automated method I'm hoping to achieve.
All and any input gratefully received.

there is a paid / commercial offering to integrate eBay/Amazon to a Zen Cart website. I have never used it though, so I could not comment. Google Holbi. Best of Luck.

ray-the-otter:

there is a paid / commercial offering to integrate eBay/Amazon to a Zen Cart website. I have never used it though, so I could not comment. Google Holbi. Best of Luck.

Thank you kindly for the info Ray, much appreciated.
I think I'll have wait til I've made a few quid yet by the looks of it, it's quite steep...

You aren't going to be able to accomplish that without custom code, and it's unlikely you will find a free solution that exists for this..