QRPayment.php
public function setAccount($iban, $swift = null)
    {
        if ($swift !== null) {
            $iban .= '+' . $swift;
        }

        return $this->add('ACC', $iban);
    }
public function setAccount($iban, $swift = null)
    {
        if ($swift !== null) {
            $iban .= '+' . $swift;
        }

        return $this->add('ACC', $iban);
    }
Set account

@param string $iban IBAN
@param string|null $swift SWIFT
@return QRPayment
@throws RuntimeException