We want to promote DevFund and make its badges visible in BlenderMarket's profiles (other publicly visible badges will also be accessible in the webhook payload).

To do this BlenderMarket must be able to

1. integrate with Blender ID allowing people to link their Blender ID accounts to their BlenderMarket accounts;
2. setup an endpoint for user-modified webhook
   
   caveat emptor: Blender ID doesn't filter which hooks to send user updates to based on whether a user has a token linked to an app or not, it just sends user-modified to all existing hooks, and no link exists between an OAuth app and webhooks;
3. whomever manages BlenderMarket must be able to generate webhook secret for BlenderMarket OAuth2 app in Blender ID
   
   Django admin doesn't allow to configure permissions for this use case, better to build a custom UI for this.

Whatever is missing must be implemented, and whatever already works (2, and, possibly, 1) has to be documented to the extent it can actually be used to implement the integration on BlenderMarket's side.