private function _normalizePaymentToken(string $token = ''): string
    {
        if (StringHelper::substr($token, 0, 4) === 'tok_') {
            try {
                /** @var Source $tokenSource */
                $tokenSource = Source::create([
                    'type' => 'card',
                    'token' => $token
                ]);

                return $tokenSource->id;
            } catch (\Exception $exception) {
                Craft::error('Unable to normalize payment token: ' . $token . ', because ' . $exception->getMessage());
            }
        }

        return $token;
    }