Hi,
You can skip the Stripe setup and test the backend out on cash/fiat payments. Stripe is for processing credit cards. To process credit cards you need to provide Stripe with your business information (supported in 42 countries).
For some business in a more restrictive country you might want to look into setting up a Stripe atlas account: https://stripe.com/atlas/global
You can always respond back to our customer rep email if you have any questions.