My B2B is running on 7.3 now.
I have been looking around here and there and it seems to work in front and backoffice.
Only, when I open an order in admin I get this message on the top of the screen:
Notice on line 219 and line 227 in file
(PSfolder)/classes/Currency.php
[8] Undefined offset: 1
Just noticed: only when admin is in English, in Polish language there is no Notice :-)
I need to test on the production site because there is no time to wait. If it crashes I will put a copy on another server that runs 7.2.
A lot of providers will keep on offering this. One.com will kill 7.2 by the end of november. Their support tech suggested me to move to Woocommerce with a transfer tool :-)