Judo, a payment service provider (PSP) based in the United Kingdom, provides merchants with a payment application that integrates with their native mobile application using a software development kit (SDK) or application programming interface (API). Android, iOS, and Xamarin SDKs are available for mobile applications. The SDKs are preconfigured with a payment screen that can be customized to match the merchant’s branding. The Judo payment app encrypts card data. A merchant-specific token along with its secret password is used to authenticate the merchant and application when a payment req...