adyen is described as 'Accept payments everywhere
Meet the payments platform built for any business and every customer journey' and is a payment processing service in the business & commerce category. There are more than 10 alternatives to adyen for a variety of platforms, including Web-based, Android, iPhone, iPad and SaaS apps. The best adyen alternative is PayPal. It's not free, so if you're looking for a free alternative, you could try PayPal or Skrill. Other great apps like adyen are Lemon Squeezy, Airwallex, Primer.io and Dodo Payments.