https://en.wikipedia.org/wiki/ISO_4217
https://www.normaculta.com.br/numeros-por-extenso/

--------------------------------------------------
Note added at 13 mins (2020-09-15 10:38:51 GMT)
--------------------------------------------------

The ISO standard does not regulate either the spacing, prefixing or suffixing in usage of currency codes. According however to the European Union's Publication Office,[6] in English, Irish, Latvian and Maltese texts, the ISO 4217 code is to be followed by a hard space[7] and the amount:

a sum of EUR 30
In Bulgarian, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Lithuanian, Polish, Portuguese, Romanian, Slovak, Slovene, Spanish and Swedish the order is reversed; the amount is followed by a hard space and the ISO 4217 code:

une somme de 30 EUR