An Elixir Package for verifying VAT identification numbers using the VIES service.

To validate a VAT identification number, simply run:

iex(1)> ExVatcheck.check("GB333289454")
%ExVatcheck.VAT{
  exists: true,
  valid: true,
  vies_available: true,
  vies_response: %{
    address: "BC0 B1 D1 BROADCAST CENTRE\nWHITE CITY PLACE\n201 WOOD LANE\nLONDON\n\nW12 7TP",
    country_code: "GB",
    name: "BRITISH BROADCASTING CORPORATION",
    request_date: "2019-04-06",
    valid: true,
    vat_number: "333289454"
  }
}

If available in Hex, the package can be installed by adding ex_vatcheck to your list of dependencies in mix.exs:

def deps do
  [
    {:ex_vatcheck, "~> 0.3.1"}
  ]
end

Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/ex_vatcheck.

To run the full test suite, run:

$ mix test

To run the test suite with a code coverage report, run:

$ mix test --cover

To run the linter, run:

$ mix credo

To run static type analysis on the project using Dialyzer, run the following command:

$ mix dialyzer

The first time this command is run, it will first generate the PLT for the Elixir standard library. It can take a little while, but subsequent Dialyzer runs should be take a fraction of the time. The compiled PLT is saved at ~/.dialyxir_core_${OTP_VERSION}_${ELIXIR_VERSION}.plt. More information about the PLT can be found here: https://github.com/jeremyjh/dialyxir#plt.