Stripe is the most popular payment solution, offering SDKs for iOS and Android, accepting a wide range of payment methods, including local payment methods in many countries, with prebuilt UI components that can be customized to build a checkout flow. Stripe charges 2.9% plus 30¢ per transaction, plus an additional 1% fee for international cards and an additional 1% if a currency conversion is required. Braintree is another powerful in-app payment solution, offering SDKs for iOS and Android, but with limited customization options for the checkout UI. Adyen supports iOS and Android, accepting a wide range of payment methods, with both ready-made drop-in interfaces and highly customizable components available. Judopay is an in-app payments solution that describes itself as mobile-first, providing easy-to-integrate SDKs for React Native and Xamarin, with highly customizable pre-built checkout pages. Square offers a Flutter SDK, supporting iOS, Android, and React Native, with an easily customizable pre-built checkout flow. Paysafe supports iOS and Android, but does not offer any pre-built checkout components, requiring the developer to build their own. Checkout.com has a high focus on its mobile SDKs, offering fairly customizable pre-built UI modules that can be adapted to most cases. Authorize.Net is a payment solution developed by Visa, supporting major credit card and digital wallet providers, but without pre-built UI checkout components. Trust Payments offers highly customizable pre-built checkout UIs, with a big focus on security, but only an iOS SDK available. BlueSnap is a powerful payment solution that accepts more than 100 payment methods, offering extensive features, but with limited customization options for the checkout form.