I'm interested in getting more knowledge about carding OPSEC and payment gateways.

if you still interested, pm me. My friend has written a good guide about DW OPSEC for his team.

check out my VM, link in signature, it comes with a detailed guide about opsec and setup tips https://txgate.io/images/smilies/smile.gif

There are a lot of OPSEC guides just spread around carding forums, google out!