I accidentally paid 2K from redcard to the wrong barclays card and now have -2k in balance. Not worried cuz I'll just spend it in redcard next month :-D
First off, you're breaking the rules by not just shmoozing here, you're talking business j/k
Not a big deal for just once, but its good to keep track (like in a spreadsheet) because its suggested to not have many payment sources to the same credit card, it might trigger a human looking at it and in a few cases, request for bank statements, etc.