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Idempotency

Send a UUID in Idempotency-Key on money-moving writes:
  • Local transfer
  • Identity lookups (BVN / NIN)
  • VAS purchases (airtime, data, cable, electricity, betting, internet, eSIM)
  • Gift card orders (buy & sell)
  • Virtual card fund / withdraw / close
  • Crypto buy / sell / send / swap / confirm
Not required on validate helpers (/transfers/validate, /vas/cable/validate, /vas/electricity/validate). Reuse the same key to safely retry without double-charging.