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Uber is the payment processing service behind Uber. The company behind the service has processed over 320 million cards (payment sources) and 1.6 billion transactions. As of March 31, 2021, the Uber brand leverages Marqeta. The payment service can be leveraged by running custom applications in Spring Boot, which require the ability to perform financial transactions in the domain domain. The service is a middleware middleware product and makes RESTful calls to the payment platform, which acts as a RESTful product.