Having been working on open banking for the past 12 months, I can see a lot of similarity and potential here. If I'm correct, you're trying to be true layer for Latin America.
Now question time, maybe a bit harsh but you need to think about it.
1. simple one, where is the user authentication flow?
2. the harsh one: as the same problem in OB, just curious what's your thought about building the trust between a third party (TPP or your client in your case) and the end-users? You know in the UK, even OB is relatively mature, you don't see many people willing to login to their bank account via a third party app, even though we all know it's very safe in the technological point of view. But trust is not something you can simply build with technology.
Now question time, maybe a bit harsh but you need to think about it.
1. simple one, where is the user authentication flow?
2. the harsh one: as the same problem in OB, just curious what's your thought about building the trust between a third party (TPP or your client in your case) and the end-users? You know in the UK, even OB is relatively mature, you don't see many people willing to login to their bank account via a third party app, even though we all know it's very safe in the technological point of view. But trust is not something you can simply build with technology.