validating PayPal IPN, 242–243
VersionMismatch fault code, Google, 126
versions
eBay API, 228
RSS 0.91
described, 17
XML template, 319–320
RSS 1.0
described, 18
XML template, 320
RSS 2.0
described, 18–19
XML template, 320–321
volume discount shipping, FedEx, 183