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All amounts in PayNext — whether in Plans or API requests — use (integers). This avoids floating-point errors and matches how payment processors handle currencies.
Ensure your processor supports the currency before sending a request. See the Integrations Guide for supported currencies per processor.

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Amount limits

An amount you send in an API request must be greater than 0 and at most 1000000000000 (10^12) minor units. That is 1,000,000,000,000 in a 0-decimal currency such as JPY, 10,000,000,000 in a 2-decimal currency such as USD, and 1,000,000,000 in a 3-decimal currency such as IQD. An amount outside this range returns a 400 error. The limit is above every processor’s own maximum, so a processor can still decline an amount it does not accept.

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Supported Currencies