A: Your friend is not a security researcher. Unless he personally reviewed every line of obfuscated PHP code (unlikely), it is almost certainly not clean.
Tampered code can degrade performance, break marketplace features, or conflict with payment gateways, shipping modules, and SEO tools—undermining seller and buyer trust. Webkul Opencart Marketplace Nulled Scripts
This guide is for educational purposes only. Using nulled scripts can pose security risks and may violate the terms of service of the software provider. Webkul Opencart Marketplace is a legitimate software that offers a wide range of features for creating a multivendor marketplace. This guide is not intended to promote or encourage the use of nulled scripts. A: Your friend is not a security researcher