I hope you're having a fine day today. Aside from using Razorpay, I'm here to help you look for other payment processing services.
There might be other third-party payment services that you can integrate for QuickBooks invoices. You can visit the Apps page and look for one. Simply log in to your QuickBooks Online company file, then click the Apps menu on the left panel.
Use certain keywords like "payments" or "process payments" in the search box.
However if you decide to use Razorpay, you can check out this article for more details: Payment enabled invoices—Razorpay.
If you need help managing your QuickBooks Online data and financials, I'd recommend visiting our articles. They can assist and guide you with specific processes and give you important details about the tasks. Check them out here.
Do you have other questions related to your QuickBooks Online account? Let me know in the reply section below. I'm more than happy to help again.