Can you provide more information on the issue you've had with integrating with Stripe? You may contact the app provider and request them to contact Intuit developers to initiate a connection or to further check on the integration. Here's the link to the website: Intuit Developers Community.
Feel free to leave a comment below if you have any other questions.
QuickBooks Online can integrate with 3rd party applications as long as it's supported in the list under Intuit App Center. Please know that for any integration process this should be done by the Software Developer of the application (Stripe) you're using. If you wish to get the application integrated with QuickBooks Online, we'd recommend contacting the app developer of the application and contact Intuit Developers. They're the best support group that can provide more information on the process.
Drop a comment below if you need more help with QuickBooks.