Setup pandoc as a service

I have Apache container that runs PHP application in specific port in centos VM and I am trying to use Pandoc document conversion tool as a separate service to be used from the PHP container.

I have got a Pandoc (executable) docker Image installed from docker Hub, I need to link this Image to PHP container so that I can use Pandoc commands from the container.

Can you help me out.

Thanks,
Jai