I'll share some details about the NachoNacho app integration with QuickBooks Online (QBO).
For the time being, integrating the NachoNacho app using the International version of QBO isn't an option. To check for available apps that have similar functionality to the said application, you can go to the Apps menu.
Also, you may want to check out one of our Help pages as your reference to guide you in managing your business growth and transactions in QBO: QuickBooks Learn and Support. It includes help articles, Community discussions with other users, and video tutorials, to name a few.
If there's anything else you need or you have other concerns about integrating applications to QBO, I'm always ready to help. Take care, @userleo.