Thanks for the clarification on self-registration. To be clear, you are not limited to the workflows that are preconfigured as part of the templates (or any of the associated resources), you can add, modify or remove resources from the application template at your discretion. The template provides a starting point for your application, so if you did ever want to get to self-registration of devices, you can certainly build that workflow within the template.
Now, you state, your main request is to “add many devices easily using just one webhook and one piece of device code for all devices” - in doing some digging, it seems that you may have a had a similar issue a few months ago, there are some great resources provided here:
In reviewing this thread, can I assume that you have the webhook-url configured in your device(s)? I just want to ensure that I understand how you are triggering the webhook?
Thanks,
@Aidan_Zebertavage