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Symptom

Kyren Pay rejects a request because an amount, currency, or timestamp field is invalid.

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Likely causes

  • Amounts are sent as JSON numbers instead of strings.
  • Amount strings contain commas, currency symbols, or unsupported precision.
  • The currency is not supported for the requested product or payment method.
  • The currency code is not a three-letter code such as USD.
  • Timestamps are sent in seconds or formatted date strings instead of Unix milliseconds.
  • Date-range queries use the wrong timezone or swap start and end timestamps.

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Check this in Kyren

  • Confirm supported currencies before creating checkout sessions.
  • Compare the product currency with the request currency.
  • Review examples in the API reference for timestamp fields.

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Check this in your server

  • Send amount values as strings, such as "9.99".
  • Use uppercase three-letter currency codes.
  • Send Unix millisecond timestamps, such as 1736932200000.
  • For date ranges, ensure start_time is earlier than end_time.

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Fix

Normalize request data before calling Kyren: convert decimal amounts to strings, validate currency codes against supported currencies, and convert dates to Unix milliseconds.

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Contact support if unresolved

Contact Kyren support with the endpoint path, response error, amount string, currency code, and timestamp values used in the request.