fun BigDecimal?.toUsd(decimals: Int = USD_FORMATTER.maximumFractionDigits): BigDecimal
Format a BigDecimal USD value as a BigDecimal USD value, right-padded to the given number of fraction digits. Start with USD -> End with USD.
decimals - the scale to use for the resulting BigDecimal.
Return
this BigDecimal USD value converted into USD, with proper rounding and precision.