Whilst most account activity will be automatic - charging plans debiting amounts, and site owners making payments into the accounts - there will be occasions where manual adjustments are needed.
There are two main types of adjustment:
These are simply extra debits and credits posted by the reseller to reflect activity that the server doesn't otherwise know about. For example, as a debit, a reseller might want to charge for the purchase of a domain name, or for some design work. And as a credit, the reseller might want to note payment made by check or cash.
If the site owner disputes a transaction on the account, the transaction can be marked as pending. This removes it from the credit limit calculations, but leaves it on file for when the dispute is resolved, and it needs to be reinstated.