Hi there, @jchristo.
Creating a refund from a supplier using the QuickBooks Online app on the iPad isn't an option. However, you can do this by accessing your account on the browser.
Here's a link that you can check out about making refunds for suppliers depending on the scenario that you're in: Handle supplier credits and refunds.
Our developers are continually working on improving the product and make it work the way your business needs.
As we assess the preferences that we gather from our users, I encourage you to visit our QuickBooks Online Blog. This way, you'll stay current with our news and updates.
I'm just a reply away if you have any other questions. Have a great day!