I am thinking of building a mobile app that will have a feature where the user picks their favorite charity and donates to it in the course of using the app (similar to how smile.amazon.com allows the user to pick charities and donate to them seamlessly while using amazon). What tools are available for this use case on different platforms? Ideally I want to avoid onboarding charities one-by-one, and instead use some kind of intermediary API.
I am not experienced with payment-related tech, so apologies if this is a simplistic question.