Error code: Property Name:failed to parse json object

We've got a dedicated team ready to help you figure out what's causing the trouble, Heather. Let me connect you to our Intuit Developers team.

They are more familiar in terms of providing support for any application at every phase of integration, from concept to launch. For you to reach out and join with the other developers, you'll have to log in or create an account if you don't have one. 

Once you're set up, make sure to choose the specific QuickBooks product that you're working on. I've attached a screenshot to guide you through it:

And then, click the Ask a Question button so you can start providing your concern about the error that you're getting. 

Additionally, once everything is functioning smoothly and you've successfully created an invoice, you can learn how to receive and record invoice payments. For more information, please refer to the article I've included: Record Invoice Payments in QuickBooks Online.

Let us know if you have any other concerns or challenges that you're experiencing while integrating with QuickBooks. We're always here to commit and ensure you'll have a seamless experience and make sure everything runs smoothly. Have a nice day ahead!