Hi @computin_dev, welcome to the community!
n8n does not have support for all relevant methods unfortunately. The webhook node would not support OPTIONS requests for example. I really wish it was different but that’s unfortunately the current status.
So for the time being you would need to implement this on a reverse proxy level, similar to what @roemhildtg described over here for example.
Alternatively, you could consider using a designated webhook router such as Hookdeck or Convoy to receive the webhooks and forward them to n8n. These are likely better equipped to handle browser requests, check for example this post on the Cloudron forums discussing a similar problem.