An iTunes price checker using iTunes Search API lookups and a CSV file. Written in PHP.
For more information on the iTunes Search API: https://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html
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Get the iTunes URL: In iTunes Mac/PC, you can copy URL links from the iTunes Store. Right click an item and select "Copy URL." If you don't want to use iTunes, search for items using: https://linkmaker.itunes.apple.com/ and get the URL from the results.
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Extract the ID from the URL: Once you have the URL, the ID is the digits after "id" in the URL.
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Use my JavaScript helper: It's in the URLtoID directory.
For the regex pattern: id(.+)