Instant transfer of funds between different payment systems presents a great challenge. Interoperability of payment systems will play a major role in the modernization of existing financial systems and in the development of new payment systems, which are introduced daily. Interchange of funds between these systems should be direct and instant. To achieve this, we need a protocol that directly addresses these requirements. Such a protocol is Interledger, which we describe in detail.In this thesis, we critically analyse the field of payment system's interoperability and present in full detail a new payment protocol, named Interledger. We develop and describe a software solution, which enables sending funds through this payment system. We evaluate the solution by executing a transfer over three different existing payment systems. Based on the results, we conclude that our implementation of an Interledger connector solves the given problems.
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