Set credit limits for accounts, and have their available credit to be adjusted from a number of integrations such as QuickBooks Online, so that they can only order a certain amount on credit:
Setting A Credit Limit
On the account sidebar where you edit an accounts setting, you can set a credit limit for the account.
View Available Credit
An accounts available credit is updated from any integrations outstanding balance, less any non-invoiced non-preliminary orders.
If an account tries to order more than they’re allowed to, they’re given an error.