Hello, I am a PHP developer with 8 years of experience. I have experience with BoxBilling and I can develop server, domain, and gateway plugins. I personally use BoxBilling to bill my hosting clients so I'm very familiar with it. I have not used the API for your payment gateway before but with an API documentation, I can build a plugin. The docs you attached to the project is not in English but if you could provide an English version that'll be great