VatNumberKit - A Swift VAT validation library for iOS and macOS

dependencies: [
    .package(url: "https://github.com/frederik-jacques/vatnumberkit.git", .upToNextMajor(from: "0.1.0"))
]

import VatNumberKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let validationOutput = VatNumberKit.parse(vatNumber: "BE0651634023"), validationOutput.isValid {
            print("The VAT number has a valid format")
        }
        
    }
}

VatNumberKit.validateOnline(vatNumber: "GB835145337") { result in
    switch result {
    case .success(let validation):
        if validation.isValid {
            // Retrieve the meta data for this VAT number (name & address)
            // Metadata is not always available.
            if let metaData = validation.metaData {
                print("§§ Name - \(metaData.name)")
                print("§§ Address - \(metaData.address)")
            }
        }
        else {
            print("§§ VAT number is not valid")
        }
        
    case .failure(let error):
        print("Error validating number")
        if let validationError = error as? VatNumberKit.ValidationServiceError {
            switch validationError {
            case .invalidUrl:
                print("The request url was not valid")
                
            case .invalidJsonResponse:
                print("The json returned from the service is invalid")
                
            case .invalidUrlResponse:
                print("The response returned from the service is invalid")
                
            case .validationServiceDown:
                print("The validation services is down")
                
            case .vatNumberHasIncorrectNumberOfDigits:
                print("The supplied VAT number has an incorrect number of digits (UK service only)")
                
            case .vatNumberDoesNotMatchRegisteredCompany:
                print("The supplied VAT number does not match a registered company (UK service only)")                        
            }
        }
        else {
            // Regular error
        }
    }