Why doesn't the accounts receivable in Chargezoom match my QuickBooks?

The AR will differ if a payment was ever made on QB and credit is available for that customer. The AR on Chargezoom only reflects the unpaid invoices there and do not take into account any credits the customer may have. QuickBooks can do this and adds it with the AR there. If both AR starts at $0 and all payments are made through Chargezoom, it should match.