I spent almost an entire day last week fighting with UTF-8 encoding and PayPal IPN integration with the Tentacle Software store. From a development perspective, I really like IPN. It lets your order processing workflow accept payment notifications from PayPal when a transaction is completed (not just standard purchases, but recurring payments and even any refunds that you issue), and it’s been pretty much rock solid since we launched Disk Management a couple of months ago. That was, of course, until the ordering process happened to send a non-ASCII character in a payment request to PayPal (an accented...