src/Common/Message/AbstractRequest.php
public function getCurrencyNumeric()
    {
        if (! $this->getCurrency()) {
            return null;
        }

        $currency = new Currency($this->getCurrency());

        if ($this->getCurrencies()->contains($currency)) {
            return (string) $this->getCurrencies()->numericCodeFor($currency);
        }
    }
public function getCurrencyNumeric()
    {
        if (! $this->getCurrency()) {
            return null;
        }

        $currency = new Currency($this->getCurrency());

        if ($this->getCurrencies()->contains($currency)) {
            return (string) $this->getCurrencies()->numericCodeFor($currency);
        }
    }
Get the payment currency number.

@return string|null