Every country has different document types and we expect one of then on "documentType" field.

CountryDocument Type
ArgentinaCUIL, CUIT
BrazilCPF, CNPJ
ChileRUT
ColombiaNIT, CC (Citizenship Card)
EcuadorRUC, CE (Cédula)
MexicoRFC (Federal Taxpayer Registry)
PeruRUC
UruguayRUT, CI (Identity card)