Key card programming

Hi,

I purchased door locks which use contact-less RFID cards for access. I wanted to integrate the software which writes these key cards with my billing system.

I tried to contact the locks vendor from China for the source code,but unfortunately the company closed down a long time ago. Therefore my only option is to redesign my own key card reader/writer program with totally a different encoder/card reader/writer, because the one i bought with the locks is likely to be having an encryption which i don't know about.

Kindly, advice me is its really possible for me to keep my door locks and redesign a new door lock access system with another encoder/reader/writer, and what frameworks/sdks do i need to start off with?

My locks use contact-less cards.

Thanks in advance