How to correct bank transaction due to vendor paid from wrong account?

I am not an accountant or bookkeeper and only self-taught with QB Online.

I recently paid a vendor from Bank Account A instead of Bank Account B in the amount of $368.  My boss said not to worry about reversing the payment and he was transferring $368 from Bank Account B to Bank Account A for the same amount (as reimbursement).  But then, he made a mistake and did the opposite; transferred $368 from A to B.

What is the proper way to post this transaction in QB and fix it?  If Journal Entry, please explain in detail.  I am new to this but learn very quickly.

Any help is appreciated.