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The transaction-feed webhooks (PAR-151/153/155/160) have no player documentation. Add it to the /docs portal.
docs/guides/webhooks.md (player + developer): what webhooks are; set one up on the site at /me/webhooks (no API key — scope to your personal account or a finance-access firm); set one up via the REST API; the delivery payload + headers; verifying the X-Treasury-Signature HMAC-SHA256 signature (with a code example); Discord auto-embeds (paste a Discord webhook URL, no code); reliability (settled-only, retries/backoff, auto-disable, delivery-health view); managing (pause/enable, rotate secret, delete). Linked from guides/index.md and cross-linked from guides/api.md.docs/admin/webhooks.md (admin-only section): the /admin/webhooks page — list/search/filter every webhook, create one for an arbitrary account. Linked from admin/index.md.Follow-up to PAR-151/153/155/160. User-docs (not dev-docs) tone, matching the existing Stripe-style guides.