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The custom amount to apply to an invoice. If you include a label, you must include a custom amount.
objectlabelrequiredstring^[\S\s]*$The label to the custom amount of the invoice.
amountobjectThe custom amount value. Value is from -1000000 to 1000000. Supports up to two decimal places.
currency_coderequiredstringThe three-character ISO-4217 currency code that identifies the currency.
valuerequiredstring^((-?[0-9]+)|(-?([0-9]+)?[.][0-9]+))$The value, which might be:
JPY that are not typically fractional.TND that are subdivided into thousandths.