I would like to have a PCB design manufactured and plated with an ENEPIG finish. I have found a fab house that states they can perform ENEPIG finish and their site lists the plating option as one that is available. I asked said board house if their ENEPIG plating adheres to IPC-4556, which defines the plating process. They said that I would have to send the IPC-4556 document if I wanted it to adhere to it.
I have only worked with a couple of board houses in the past, and have never had to supply IPC documents for plating. These requirements were always met without question. Is requiring the customer to supply IPC documents common protocol in the PCB manufacturing world?