App with multiple sellers

I’m sorry if this is a question that has been asked before, but I couldn’t find a sufficient answer to it. I’m new to using Square and was wondering how to approach a specific type of application with flutter. I followed a couple tutorials that lead me to creating an app where I can input credit card details, and handle the nonce in the backend to pay a personal square account. I was wondering how I could approach creating an app that hosts many individual sellers. As of now I have my personal app id, token, etc, and I don’t know how to approach having multiple individual square accounts that I can pay using my app.

I just need to be pointed in the right direction if possible. Thank you!

Square’s OAuth API will be what you’ll use to let Square merchants authorize your application OAuth API. Payments will go directly to their Square accounts.