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I appreciate you for joining in this thread, @lucheol. Let me route you to our Intuit Developer support.
They are skillful in handling integration like Application Program Interface (API), developments, and other related concerns. They can check to fix the error message you're getting and help you resolve them.
I'll walk you through the steps to reach out to them:
- Go to Intuit Developer support and log in to your Intuit account.
- Select QuickBooks Online under the What do you need help with? section.
- Click Ask a Question and enter the details of your concern.
- Select Post a question.
Just like in the Community, your post will be displayed in the form and anyone with knowledge or idea about will join the conversation.
Additionally, you can personalize and add specific info to your invoice and other form styles in QuickBooks Online. To know more about it, you can check out the detailed steps in this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Please let me know in the comment section if you have follow-up questions about invoice templates or any QuickBooks concerns. I'm willing to answer them. Have a wonderful day!