They used PuTTY internally and decided they wanted to send us a load of thank-you money. The slight catch was, being a government agency they weren't allowed to make dodgy donations to people via PayPal, so instead they asked us to send them an invoice.
It's quite difficult writing an invoice for doing no (specific) work, when you're reasonably sure it will be read by part of a general accounts-payable department who isn't the guy who fully understands what the money's for. I ended up writing on the invoice "PuTTY development, as discussed in <message-id>" and printing my contact's name prominently, in the hope that the accounts department would either just accept it or check with him for approval. I don't know which one happened, but we did get the money :-)
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It's quite difficult writing an invoice for doing no (specific) work, when you're reasonably sure it will be read by part of a general accounts-payable department who isn't the guy who fully understands what the money's for. I ended up writing on the invoice "PuTTY development, as discussed in
<message-id>" and printing my contact's name prominently, in the hope that the accounts department would either just accept it or check with him for approval. I don't know which one happened, but we did get the money :-)And I wanted to check if it was just money from a tax office, or if it was in some way tax money.