Possible reasons why there is a bad request: 

1) Special characters in the item title of an invoice. Items cannot have commas, hyphens, or special characters.
Solution: To learn how to adjust your items titles, click here.

2) The invoice/payment number already exists in Quickbooks.
Solution: Change the invoice number on either PracticePanther or on QuickBooks so the invoice number is available.

3) There is a discount percentage applied on your invoice.
Solution: Create a line item discount instead following this article.
​
If the bad request still continues please click here and cancel the sync on PracticePanther. 

Then simply re-connect QuickBooks and PracticePanther by clicking "connect to QuickBooks".

If this does not solve the issue, please click on the intercom bubble on the bottom right of any page to reach out to our support team for further assistance. You can also email help@practicepanther.com any time!