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AMOUNT_NOT_MONOTONIC

Message. IOU cumulative amount is less than the previously observed cumulative

Hint. Re-issue the IOU with cumulative amount ≥ last accepted cumulative.

Wire shape

{
  "error": {
    "code": "AMOUNT_NOT_MONOTONIC",
    "message": "IOU cumulative amount is less than the previously observed cumulative",
    "hint": "Re-issue the IOU with cumulative amount ≥ last accepted cumulative.",
    "docsUrl": "https://docs.tollgatepay.com/errors/amount-not-monotonic"
  }
}

Canonical URL

https://docs.tollgatepay.com/errors/amount-not-monotonic — this URL is hard-coded into the 402/403/451 docsUrl field. It is stable; renaming the slug requires a migration plan.

Related codes