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AMOUNT_MISMATCH

Message. IOU delta (current - previous) does not match this request's advertised price

Hint. Re-fetch the 402 response for the current price and re-sign.

Wire shape

{
  "error": {
    "code": "AMOUNT_MISMATCH",
    "message": "IOU delta (current - previous) does not match this request's advertised price",
    "hint": "Re-fetch the 402 response for the current price and re-sign.",
    "docsUrl": "https://docs.tollgatepay.com/errors/amount-mismatch"
  }
}

Canonical URL

https://docs.tollgatepay.com/errors/amount-mismatch — this URL is hard-coded into the 402/403/451 docsUrl field. It is stable; renaming the slug requires a migration plan.

Related codes