Provisioning Electron through API

Can anyone tell me if there is a way to provision an Electron through the REST API rather than through the web page? I’m in the process of planning out an NPI line and as we ramp up production, having the Particle web page as part of the process is a bit of sticking point.

I see there’s a call to claim ownership of a device, but I can’t see that there’s any way to register a SIM card except through the web pages.

Any guidance would be appreciated. Thanks.