Hardcoded APN into SIM?

Hello,

I'm currently deploying a new mobile 3G/4G product into our network, the main aim is to have zero-touch provisioning on the service so the end-user can simply plug-and-play.

We've got our supplier to dynamically map the MSISDN into the PPP auth request which we are using to authenticate each unique SIM, although, the end-user still needs to configure the APN.

My knowledge is quite limited and I'm learning on the project, but I was wondering if it is possible to hardcode the APN into the SIM, or alternatively, have the SIM pickup the correct APN required for the service? The APN is a custom APN provided.