What is this about?
orphans: globalcollect_gateway_tr 27169358:4479613483 processResponse Error 21000050 : Blocking validation problems with this payment. Investigation required!
We received 20 of these today, from the frontend and the orphan slayer. Grepping through the logs, I see that we got 1,326 of these in July, 111 in June, and only 2 in May. I don't like that it's growing bigger. Doesn't look like it's proportional to traffic.
Also: We seem to be in danger of losing some institutional knowledge, let's document the common errors and investigate what constitutes a "flood of errors" for each one. I've never heard of this error, but as recently as a year ago someone lovingly crafted code paying homage to this particular error.