Register a new outbound webhook endpoint. Returns the full row
PLUS the plaintext signing_secret (whsec_<48 base32>) — this
is the ONLY response that ever contains it. Show it to the
merchant once, prompt them to store it, and don’t surface it
again on subsequent fetches.
Documentation Index
Fetch the complete documentation index at: https://docs.stella-commerce.com/llms.txt
Use this file to discover all available pages before exploring further.
Successful Response
Response shape for POST /webhooks (creation) AND GET /webhooks
listing. Note: signing_secret is ONLY populated on the creation
response; list responses always omit it (server-side this is set
to None on listing).