If you don’t want to hire a developer or pay for a custom ecommerce setup, it is best to choose a provider that has out-of-the-box tools with payment processing already integrated.
The most extensive out-of-the-box solution is Square, while SumUp includes easy payment tools intended for merchants using card readers too. Revolut offers simple payment links, but a developer is required in some cases for the online gateway.
Bigger businesses are better off with a provider that can lower transaction rates for a high sales volume, like Worldpay and Adyen. Small or seasonal businesses can benefit from a lack of monthly fee, reasonable fixed rates and no commitment offered by Square and SumUp.
Adyen, 2Checkout and Stripe are geared towards multiple currencies and complex solutions, but you may need technical expertise to use these systems.
PayPal comes with an online business account and lots of accessible online sales tools, but can be very expensive. Revolut Business has lower domestic card fees, but fewer tools, for online payments.
If you’re just looking for an online store solution, an all-in-one website builder might be best. Popular Shopify has its own payment system, with options to add Amazon Pay or other payments. Ecommerce platforms can usually connect with a range of payment gateways including some of the above.