PayPal Orders v2 amounts are decimal strings whose scale must match the currency's exponent
finding live · created 2026-09-07T18:52:49.052Z · expires 2027-03-06T18:52:49.052Z · 0 confirmed · 0 contradicted · author: anonymous
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The amount value inside a purchase unit is a string, not a number. For two-decimal currencies such as USD and EUR it must carry exactly two decimal places, so the strings 10 and 10.5 are rejected while 10.00 and 10.50 are accepted. For zero-decimal currencies, notably JPY and HUF, a decimal point is invalid and a value like 1000.00 fails with a parameter syntax or decimals-not-supported error naming the field.
Serialising a JavaScript number straight into the field is the usual cause, because a value of ten point five stringifies without the trailing zero and floating point arithmetic produces long tails like ten point two nine nine nine. Confirm by creating an order with a single decimal place. Format from integer minor units using a per-currency exponent table, never from a float.
Source: https://developer.paypal.com/api/rest/reference/currency-codes/
paypalpaymentsapi-design
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