I received an order last night right around the time of Bricklink's maintenance
according to Paypal. Paypal is showing payment received but no order is posting
on Bricklink.
[...] Did you receive an email copy of the order? Orders submitted close to maintenance times may go missing for reasons known only to the server admins. If you have an email [...] (13 months ago, May 19, 2023, to Technical Issues)