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Payment system in a disaster area is essential for people to buy necessary amenities, like groceries, clothing, medical supplies. However, existing payment systems require communication infrastructures (like wired networks and cellular networks) to enable transactions, and thus cannot function well in disaster areas where these communication infrastructures may be likely destroyed. Therefore, an infrastructureless payment system is required. In this paper, we propose a mobile payment system by adopting infrastructureless mobile ad-hoc networks (MANETs), which can allow users to purchase amenities in disaster areas while providing secure transactions. Specifically, we propose an endorsement-based scheme to guarantee each transaction and a location information based monitoring scheme to achieve transaction validity and reliability. By employing e-coin, blind signature and one-time session token techniques, our mobile payment system can also prevent collusion, reset and recovery attacks. Also, we introduced chains of endorsement to ensure that transactions are not delayed or unsuccessful when endorsers are not present during the transaction.