I can route you to the right support team who currently handles integrations to QuickBooks Online (QBO), Rescale.
Adding custom fields to your QBO account in a sandbox requires special handling from our Intuit Developer Team.
I recommend seeking help through another forum. We call in Intuit Developer Forum. It's a place where different developers and coders help each other with app integrations and programming.
Here's how to get in touch with them:
- Go to this link: https://developer.intuit.com/.
- Scroll down, then click Contact us under the Intuit column.
- Click Ask A Question.
- Select your subscription.
- Sign in to your QBO account and follow on-screen instructions.
In addition to that, you can browse this link for instructions and tutorials to help you track customer's information : Create and edit custom fields in QuickBooks Online Advanced.
Stay in touch with me if you need anything else by commenting below. I'm always right here to help you with QuickBooks.
