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The custom amount to apply to an invoice. If you include a label, you must include a custom amount.
objectlabelstringThe custom amount label.
amountobjectThe currency and amount of the custom value. Value is from -1000000 to 1000000. Supports up to two decimal places.
valuerequiredstringThe value, which might be:
JPY that are not typically fractional.TND that are subdivided into thousandths.