Using QBO API, "CustomField" is empty for Invoice ID 7875, but I see "Advertiser" in UI. Why is it missing in API response? Is it supported?

I’d be glad to assist you with your concern, RAP-Ventures, but our Developer Community forum is better suited for these issues.

Since you're using the QuickBooks Online (API), I suggest sharing your question there to investigate the options for accessing a complete list of invoice custom fields.

This website provides software development resources and lets you connect with other developers to ask questions. Our Intuit Developer can offer more insights on developing or integrating invoice custom fields feature.

Here's how:

1. Go to this link: https://help.developer.intuit.com/s/.
2. Choose QuickBooks Online under What do you need help with?
3. Click Ask a Question.
4. Log into your existing Intuit Developer Account or create a new one.
5. Enter your concern.
6. Click Ask.

You can also explore the API Docs & Tools and Blog sections on the Intuit Developer's website to stay updated on the newest features added to the application.

Leave a comment on this thread if you have any additional questions or concerns about the missing custom fields. We're here to help.