It sounds like you're having general problems communicating with their SOAP API, which given, is a pain to use.
Try searching for existing PHP libraries that'll take care the grunt of the work. e.g. Amazon API Access with PHP and XML (amazon, catalog, webservice, shop) - PHP Classes
Just out of interest, what are you plans once you have the database?
I've written a small web app with Ruby on Rails before which I used to create Adwords campaigns via their API for direct linking. This is a couple of years ago now. Worked fairly well, but I got annoyed with their 2 months delay in paying commission.
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