[Payment] - IBAN allow only specific country codes

[sandervankasteel]

A possible improvement for the IBAN validation rule is a constructor parameter in which the consumer can set the one or multiple allowed countries of which the IBAN numbers are allowed.

Potential solution

class IBAN implements Rule
{
	/**
	 * @param $allowedCountries string[] 
	 *
	 */
	public function __construct($allowedCountries = [])
	{
	
	}
}

$allowedCountries would allow setting one or multiple country codes for example:

$allowedCountries = [ 'NL', 'BE' ]; 

and thus an IBAN from DE would not be considered valid;

The default behavior would not change.

Potential QoL improvement, do something with the error message? Potentially return a message in the thought of "Only IBAN numbers from 'NL' and 'BE' are allowed to be used"?