The app is reasonably simple, except of course it's a little more involved than a to-do list from the get go since you have to maintain user's accounts, assigne

The app is reasonably simple, except of course it's a little more involved than a to-do list from the get go since you have to maintain user's accounts, assigned tasks with mutable states, transaction history etc etc. But yea no rocket science. Banking integration for this flow would be reasonably involved though. To get set up with a merchant account to take the funds is reasonably simple although you'd have to figure out how the payers tie their payment instruments to your system so you can actually charge them and then develop the functionality to drive that (more dev work). OK. So now you have the funds that you need to be able to move to recipient's accounts. THIS is where the fun begins. Provided that you have the registration flow for the recipients in place (which means more dev work but anyway) now you have to be able to disperse the funds to their accounts, track payment statuses, reconcile data across multiple sources so you are aware of the current state of the payment etc etc ad nauseam. And if you're touching a credit card number don't forget about PCI compliance :)