Input (CC/NIF/NISS) - Text

Output (IsValid) - Boolean

CC validation logic info source: 

https://www.autenticacao.gov.pt/documents/20126/115760/Valida%C3%A7%C3%A3o+de+N%C3%BAmero+de+Documento+do+Cart%C3%A3o+de+Cidad%C3%A3o.pdf

NIF validation logic info source:

https://pt.wikipedia.org/wiki/N%C3%BAmero_de_identifica%C3%A7%C3%A3o_fiscal

NISS validation logic info source:

https://www.validador.pt/