We plan to integrate a fiat payment processor such as Stripe into the application to facilitate all fiat related transactions. A payment gateway such as Stripe enables payments with all major debit/credit cards so would be a perfect fit for the limited period of when the application accepts fiat payments.
Oh, this is a cool payment processor. But it works in a limited number of countries. Mostly in developed countries. To cover most of the world, you need to add something or another solution.
Tell me, what kind of payment processor do you know that will work in many countries? I think this information will be useful for the project.