Hello,
Are you referring to the electroplating of PCBs of CNC machined parts?
If you are referring to PCBway surface finishing service on: https://www.pcbway.com/rapid-prototyping/Surface-Finishing.html
the answer is: "For custom surface finishes such as electroplating or polishing, please contact 3dcnc@pcbway.com"
Hope this helps,
Best regards,
Nermin