Add Polytomic: 1 doc-sourced sync.records sample

[garethx]

New provider: Polytomic. Its one webhook surface is the Webhook destination
connection: a Model Sync POSTs batches of changed records to your URL. This PR is the
samples stage of the add-a-source pipeline. The earlier stages are:

• skill: feat: add polytomic-webhooks skill webhook-skills#209 (merged)
• registry row: hookdeck/webhook-registry#83
• check record: hookdeck/webhook-registry-checks#15

No Hookdeck core source type exists yet; one is queued.

• Body: one sync.records sample, a one-record batch. Please read this first. It is
  the request-sample body from
  webhooks-connections, read from
  its .md mirror, with one edit. The page follows the single record with a literal
  ... for further records, and I removed that array tail. The page's own
  Content-Length: 646 against 344 printed bytes shows the real delivery held more
  records. A one-record batch is still a shape Polytomic sends: batch size is
  configurable (default 100), and a final batch is often short. No value is invented and
  no object is emptied. The edit is recorded in the file's source.note.
• Not included: the page's second, annotated copy of the body. Its metadata object
  contains only a # comment, so stripping it would leave {}, a value the docs never
  show. object.metadata is left out of the sample, matching the request sample. Its
  documented default is null.
• fields keys are not a schema. email / last_login are the fields the docs'
  example sync selected. The note says so.
• Headers: synthesized, content-type only ("Polytomic delivers its webhooks payloads
  as json only"). I left out three:
  • Authorization: Bearer <secret> is per connection;
  • Polytomic-Signature-Timestamp is per delivery;
  • there is no topic header, because the topic is carried in the body.
• topic_identifier: event, a top-level body field, so requestReceiver.ts
  resolves it flat.
• Version: latest. Polytomic has no webhook version scheme, and there was no
  existing entry to adopt.
• Provenance: latest is marked sourced_via: docs, sourced_on: 2026-10-02. The
  file carries source.type: vendor-documentation.

Checklist:

• There is no existing providers/polytomic and no scripts/polytomic harness, so no
  captures are displaced. Existing files changed: 0.
• The files are byte-identical to the registry's samples-doc/providers/polytomic/, and
  re-running harvest_polytomic.py reproduces them unchanged.
• yarn compile passes: 147 → 148 providers. yarn test: 14/14 passed.
• Registry verify.py: FAIL (0).

Merge after hookdeck/webhook-registry#83. Its row now records this sample and the
payloads gap that remains (no multi-record delivery and no metadata on the wire;
resolve by capturing one real delivery).

🤖 Generated with Claude Code

https://claude.ai/code/session_017M5zkoyQLQjXErCKTrS4X7

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Project	Deployment	Actions	Updated
webhook-samples	Ready	Preview	Oct 2, 2026 4:39pm UTC