Core interfaces and algorithms for the Finova financial toolkit.
Contains Mod97, Luhn, ISO 7064, and base models for IBAN/BIC/Card/Enterprise/NationalID
validation.
Zero dependencies.
using Finova.Core.Iban;
using Finova.Core.PaymentCard;
using Finova.Core.Identifiers;
using Finova.Services;
// Global IBAN Validation (supports all IBAN-enabled countries worldwide)
var result = GlobalIbanValidator.ValidateIban("BR1800360305000010009795493C1");
if (result.IsValid)
{
Console.WriteLine("Valid Brazilian IBAN!");
}
// Country-specific IBAN Validation
var ibanService = new IbanService();
var result = ibanService.Validate("BE68 5390 0754 7034");
if (result.IsValid)
{
var details = ibanService.Parse("BE68 5390 0754 7034");
Console.WriteLine($"Country: {details.CountryCode}");
Console.WriteLine($"BBAN: {details.Bban}");
Console.WriteLine($"Check Digits: {details.CheckDigits}");
}
// Payment Card Validation
var cardValidator = new PaymentCardValidator();
var cardResult = cardValidator.Validate("4111111111111111");
if (cardResult.IsValid)
{
var cardDetails = cardValidator.Parse("4111111111111111");
Console.WriteLine($"Brand: {cardDetails.Brand}"); // Visa
}
// ISIN Validation (Securities)
var isinValidator = new IsinValidator();
var isinResult = isinValidator.Validate("US0378331005");
if (isinResult.IsValid)
{
var isinDetails = isinValidator.Parse("US0378331005");
Console.WriteLine($"Country: {isinDetails.CountryCode}"); // US
Console.WriteLine($"NSIN: {isinDetails.Nsin}"); // 037833100
}
Dependency Injection
using Finova.Extensions;
// Register all Finova services
services.AddFinova();
// Or register specific services
services.AddFinovaCore();
services.AddFinovaCountry<BelgiumModule>();
public class PaymentService
{
private readonly IIbanService _ibanService;
private readonly IVatValidator _vatValidator;
public PaymentService(IIbanService ibanService, IVatValidator vatValidator)
{
_ibanService = ibanService;
_vatValidator = vatValidator;
}
public bool ValidatePaymentDetails(string iban, string vatNumber)
{
return _ibanService.Validate(iban).IsValid
&& _vatValidator.Validate(vatNumber).IsValid;
}
}
FluentValidation Integration
using Finova.Extensions.FluentValidation;
public class PaymentRequestValidator : AbstractValidator<PaymentRequest>
{
public PaymentRequestValidator()
{
RuleFor(x => x.Iban)
.IsValidIban()
.WithMessage("Please provide a valid IBAN");
RuleFor(x => x.VatNumber)
.IsValidVat()
.WithMessage("Invalid VAT number format");
RuleFor(x => x.CardNumber)
.IsValidPaymentCard()
.WithMessage("Invalid credit card number");
RuleFor(x => x.NationalId)
.IsValidNationalId("BE")
.WithMessage("Invalid Belgian national ID");
}
}
Country-Specific Validation
using Finova.Countries.Belgium;
using Finova.Countries.UnitedStates;
// Belgian validations
var belgiumIban = new BelgiumIbanValidator();
belgiumIban.Validate("BE68 5390 0754 7034"); // ✓
var belgiumVat = new BelgiumVatValidator();
belgiumVat.Validate("BE0123456789"); // ✓
var belgiumNationalId = new BelgiumNationalIdValidator();
belgiumNationalId.Validate("85.07.30-033.28"); // ✓
// US validations
var usRouting = new UnitedStatesRoutingNumberValidator();
usRouting.Validate("021000021"); // ✓
var usEin = new UnitedStatesEinValidator();
usEin.Validate("12-3456789"); // ✓
📋 Validation Rules Reference
IBAN Structure
Component
Length
Description
Country Code
2
ISO 3166-1 alpha-2
Check Digits
2
Mod 97 validation
BBAN
Variable
Country-specific format
Payment Card Validation
Brand
Prefix
Length
Algorithm
Visa
4
16
Luhn
Mastercard
51-55, 2221-2720
16
Luhn
American Express
34, 37
15
Luhn
Discover
6011, 644-649, 65
16
Luhn
Diners Club
36, 38, 300-305
14-16
Luhn
ISIN Structure
Component
Position
Description
Country Code
1-2
ISO 3166-1 alpha-2
NSIN
3-11
National Security ID
Check Digit
12
Luhn mod 10
📊 Test Coverage
Total Tests: 4,145+
Passing: 100%
Countries Covered: 70+
Validators: 50+
🗺️ Roadmap
Version
Status
Features
v1.0.0
✅ Released
Core IBAN, BIC, Payment Cards
v1.1.0
✅ Released
Payment References (BE, FI, NO, SE, CH)
v1.2.0
✅ Released
VAT validation, Enterprise Numbers
v1.3.0
✅ Released
National ID (51 European countries)
v1.4.0
🚀 Current
Global Expansion, Securities (ISIN, CUSIP, SEDOL), Currency
v1.5.0
📋 Planned
EPC QR Code generation, SEPA XML
v1.6.0
📋 Planned
Async validation, Batch processing
📄 License
This project is licensed under the MIT License - see the LICENSE file for details.
