A small business in any case requires proper attention, calculations, and control of finances. Of course, a payment system can greatly facilitate your work, but there are also nuances. The thing is that now there are a lot of payment gateways for small business, you can read more details about each payment portals
https://owlab.group/our-blog/post/best-payment-gateways-for-startups-and-small-businesses and choose the most suitable for you. As it seems to me the best option would be to choose the most popular and proven system PayPal, we choose this payment port for our business, so we are satisfied with our choice.