/// <summary>
/// Get registration by social security number (SSN) and PIN
/// </summary>
/// <param name="ssn">Social Security Number</param>
/// <param name="pin">PIN code</param>
/// <returns>
/// Registration result or null if no registration with given SSN and PIN was found.
/// </returns>
public async Task <GetRegistrationResult?> GetRegistration(long ssn, int pin)
{
var foundResult = await Registrations.FirstOrDefaultAsync(q => q.SocialSecurityNumber == ssn && q.PinCode == pin);
if (foundResult is null)
{
return(null);
}
return(new GetRegistrationResult(
foundResult.Id,
foundResult.SocialSecurityNumber,
foundResult.FirstName,
foundResult.LastName));
}
