Since this was for myself, and not a web-based service that would be used by others, the Simple API method of authorization was good enough. After getting it to work with Picasa, but not GAN, I asked for some help and was introduced to the OAuth 2.0 Playground. This showed me the headers I’d need to send, and how OAuth 2.0 works.
For the record: the Google Affiliate Network API does NOT support Simple API Access. You cannot access the service with an API Key and IP locking.
I now have a working script, and have written up step-by-step instructions on how you can pull orders from GAN automatically each day.
This script is not complete, as it’s up to you to do something with the data once you have it. You can also modify the final call to pull advertisers, instead of orders.
I had a need to get some data that wasn’t available in the merchant’s datafeed, and since I wasn’t going to be putting a huge burden on the merchant’s site (ie: if you scrape, be nice*) I decided to write a little scraper to do so.
In this script, I’m using all, pure PHP functions: cURL, Document Object Model, SimpleXML. By using PHP’s built-in functions, the script will be as portable and efficient as possible.