It's great to see you here today, @vishalssl22.
Let me route you to the best support who can help you add a monthly subscription to the application you've developed for QuickBooks Online (QBO).
You're unable to add a monthly subscription to the app you've developed via the QBO platform. We have a separate and dedicated forum that handles application concerns for QBO. This is where developers and business people like you discuss programming and system issues. I'd suggest getting an account set up and posting your question from there. This way, our developers can guide you on the appropriate way to complete your task. Here's how:
Also, you may want to check out our Intuit Developer Blog page as your reference in getting the latest news and marketing tips from our developer team: Intuit Developer Blog.
You can count me in if there's anything else you need in managing your business's growth and transactions using QBO. I'm always ready to help. Take care, and have a great day, @vishalssl22.
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