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<?php
declare(strict_types=1);
namespace Skrill\Exception;
use Exception;
/**
* Class InvalidSignatureException.
*/
final class InvalidSignatureException extends Exception implements SkrillException
{
* @return InvalidSignatureException
public static function emptySignature(): self
return new self('Signature should not be blank.');
}
public static function lowercase(): self
return new self('Signature should in uppercase.');