Hi there, treasurer88.
Let me share some information about adding Stripe in QuickBooks Online.
We can look for a third-party application that focuses on card handling. You can either log in to your QBO account or use this link and look for integration with Stripe.
If you search it within your account, go to Apps on the left panel. Then, enter the app name in the search box. Let's take a look at this sample screenshot:
If you don't see any that applies or suit your needs, I would recommend contacting the Stripe Customer support team to verify if it can be integrated into QuickBooks Online.
Let me know how everything goes. I'll be around to assist you further. Take care!