Add validation for Pakistan TIN

[unho]

It is called National Tax Number (or NTN for short, نیشنل ٹیکس نمبر in Urdu). It is 7 digits plus a check digit. Format is like 1234567-8.

• https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Pakistan-TIN.pdf
• Get check digit online for a NTN without it (also provides company name for quick validation): https://e.fbr.gov.pk/NTNCheckDigit.aspx
• https://propakistani.pk/how-to/how-to-get-ntn-verified-online/
• http://demoen.tindb.cz/country-pk.html
  • Says it is 7 digits + 1 check digit, with the format 0000000-0.
• https://world.salestaxhandbook.com/pk-pakistan
• https://tin-check.com/en/pakistan/

Online search:

• https://e.fbr.gov.pk/esbn/Verification?PID=e35mmWrJKMV1u9Kvqk6agw==#

Examples:

• Thousands of examples in "Active Taxpayer List (Income Tax)" link in https://www.fbr.gov.pk/categ/active-taxpayer-list-income-tax/51147/30859/71169
  • Or direct link to it https://www.fbr.gov.pk/Downloads/?id=3901&Type=Docs
  • Note this XLSX contains both CNIC for individuals and NTN for companies, so scroll down!
• Found on the Internet:

  3804142-1 0801599-6 0816469-0 0698343-0 0711795-7 0801380-2 2217220-3 2168117-1 0700271-8 0711545-8 2138500-9 3027108-8 0785983-0 4368251-7 1347561-4 1543137-1 0710060-4 0658560-4 0712242-0 0698049-0 2261899-6 0710672-6 1268238-1 1496632-8 0698202-6 3004934-2 0822910 - 4 0660564-8 2544314-3 0657297-9 0698187-9 1158490-4 0658678-3 0912725-9 1143539-9 0711554-7 0712418-0 0999468-8 2180652-7 0711167-3 0712140-7 0709930-4 0801137-7 1868111-5 0820781-0 0709782-4 0698190-9 0711982-8 0712821-5 0676546-7 0711020-7 7443848-2 0698469-0 1688091-9 3123405-4 0815616-6 1319140-3 7757795-2 3072746-4 0133480-8 2663705-7 0657139-5 0709694-1 3093299-8