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\"tsunami Samsung Pay, the mobile payment service of Samsung Electronics, is to debut in the US on Monday, as the South Korean group looks to diversify its features to revive slow ing phone sales. The world's largest smartphone maker hope; its platform will have an edge of rival services from Apple and Google in the annual $67bn mobile payment market, as Samsung's technology is designed to work with existing credit card readers. Samsung rolled out the payment service in its home market last month and the South Korean com pany said its adoption was 'beyond our expectations\" with about $30m transactions in its first month. Samsung plans to expand the service to the UK, Spain and China, and is expected to adopt the pay ment feature to enhance its new lowtomidend smartph ones next year. However, analysts remain doubtful of the pros pects of Samsung Pay abroad, given the company's relatively late entry market and weaker software ecosystem. Apple is leading the field but even the US company is still struggling to turn the mobile phone into a mainstream method of payment, with Apple phone users complaining that the service gets rejected at many merchants. 'In the US, Samsung is facing stiff competition by coming late to the mobile payments scene,' said Siyun Zeng, analyst at IHS. 'Apple Pay has estab lished a lead in the US and lGoogle is revamping Google Wallet to Android Pay.' While Apple has accumulated 800m payment card accounts associated with iTunes, Ms Zeng said Samsung lacks a critical element for its pay ment service to gain traction. She also cautioned