Hello there,I'm learning quickbooks and try to integrate into my code.Could you please let me know where I can find the demo for insert data,update data,delete data etc..

Let me provide some details about integrating QuickBooks Online (QBO) into your code where you can enter and update data, ruanshikao-aliyu.

First off, working with QuickBooks integrated with code or API software is addressed by our team separately consisting of experts in the field of programming. We suggest contacting our  Intuit Development Support team for assistance with the integration of QBO and code. This way, they'll check the situation and provide you with a suitable solution. Here's how you can get the help you need:

1. Go to this link: https://help.developer.intuit.com/s/.
2. Choose your QuickBooks product relevant to your integration.
3. Click on Ask a Question.
4. Sign in and follow the prompts appearing on the screen to continue.

Here’s an article that provides more in-depth information about the new app and compliance process: Develop your app. For the demo for exploring all that QuickBooks Online features and data entry, you can take a test drive of QBO by using our sample company demo. You can check out this article for more details: Test drive QuickBooks Online.

Lastly, to delete your data in the program and start over with new books, just refer to this article for the steps and details: Delete your data and start over in QuickBooks Online. Feel free to watch step-by-step videos to learn your way around QuickBooks on this page: Get Started QuickBooks Tutorials. 

It'll always be my pleasure to help if you've got other questions aside from working with application integrations and data in QuickBooks. Just click the Reply button below to leave your comment so that I can lend a hand. Take care always.