app\models\AccountGateway::getPlaidEnvironment PHP Method

    public function getPlaidEnvironment()
    {
        if (!$this->getPlaidClientId()) {
            return null;
        }
        $stripe_key = $this->getPublishableStripeKey();
        return substr(trim($stripe_key), 0, 8) == 'pk_test_' ? 'tartan' : 'production';
    }