Can i do API connections in between my website and quickbooks? so that sale price, product quantity & others will be automated update in both sides?

Hello, @bacchakaccha-md-.

To help you with your concern, I'll route you to the best support available.

For handling integrations, such as APIs, developments, and other related queries, I recommend utilizing the Intuit Developer forum, where experts can guide you through the best process for your specific situation, as they are the best gurus to assist you. Here's how:

1. Proceed to this link: https://help.developer.intuit.com/s/
2. Choose QuickBooks Online.
3. Select Ask a Question.
4. Log into your existing Intuit Developer Account or create a new one.
5. Clearly explain your concerns and provide specific details and examples to help them better understand your requirements.
6. Click Ask.

Moreover, I've added this helpful article to help manage your invoices and other sales forms for future tasks: Personalise invoices, estimates, and sales receipts in QuickBooks Online.

Please know you can post anytime if you have questions or want to share your best practices using the product. The Community always has your back.

@bacchakaccha-md- 

Which eCommerce platform do you have? e.g Shopify, WooCOmmerce

You will need a 3rd party connector app