Mobile Money Idempotency Flaws Risk Double Charges as UEMOA Deadline Looms

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With the BCEAO's September 30 deadline approaching for PI-SPI platform integration, many UEMOA development teams are writing payment code under pressure. A technical analysis of three mobile money providers — MTN, Wave, and Orange Money — reveals that only MTN offers a true idempotency key via its X-Reference-Id header. MTN's 409 conflict response is frequently mishandled by developers, who may interpret it as a failure and trigger a second payment request, resulting in duplicate charges. Wave has no idempotency header at all, requiring developers to build their own safeguards using the client_reference field. The article warns that these integration gaps are the kind of bugs that only surface in production, where real customer funds are at risk.

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