Yeah, I was replying to the previous people asking about QB Desktop.  The only thing I can say about Online is that I know I looked a while back and QB Online is supposed to support REST API (I think), so that's an option.  I don't know how hard it is to sign up for a developer account and get keys, etc. to connect to QB Online, but I did something with QB desktop a few years back and it wasn't too bad.  You could find some college kid and give it to them as a project to pull down the info you need.  It's actually disheartening to hear that this isn't available in the online version as I've been looking to move to it and I have to create Check Positive Pay uploads, but I can also say that when we do move to Online we'll be looking into API Access to the company file, etc. for current things we do with desktop.  I'm sure you could reach out to the user above who has the product or if it's "that" big of a deal to you, you can find our company by searching for Adevity and we could potentially help you out with the API stuff.

Here's the data for qb online vendor object through the api explorer and print on check is available there...

https://developer.intuit.com/app/developer/qbo/docs/api/accounting/most-commonly-used/vendor#the-ven...