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Treating MTN's 409 as a failure is what double-charges the customer
Of the three mobile money APIs in one UEMOA developer's integration, only MTN ships a real idempotency key. The 409 it returns on a replay is what turned a timeout into a second payment prompt.
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Reality
- Evidence62
- Adoption38
- Hype gap+12
- Incentives28
- Confidence55