TL:DR If you encounter any problems, please contact us!
We tested an update to the shop software on our test system and it looked fine.
However when we applies it to the production system, checkout would not work.
It took us a long time to figure out that for an unknown reason a directory of sourcecode files from one of the system modules that make up the checkout flow was…empty.
We restored from the last backup and everything SEEMS to work fine again.
We are monitoring the logs for further issues.
If you encounter any problems, please contact us!
So we can look into the matter.
So far all we see is the usual automatic exploit script trying (and failing) to perform SQL-injections in our advanced search function (that can not be attacked this way).
Nothing out of the ordinary.