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Non-repudiation in e-commerce has recently gained a lot of interest but its successor brother, non-repudiation in m-commerce, is still at the start. This paper proposes an extension of existing mobile payment models to introduce an Extended Mobile Payment Service (EMPS) model, which is based on assumptions about the cooperation between mobile network operators and financial institutions to deal with different payment amounts ranging from micro to macro payment. The novel model focuses on enhancement of non-repudiation problem. Fair non-repudiation protocols are developed for not only payment phase but also other phases in a typical m-commerce transaction, including price negotiation and content delivery.
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