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Use the **batch** endpoint (200 rows per request by default — the cap is configured per environment and an over-cap response states it — with per-row outcomes) for feeds; quantity `0` marks a record out-of-stock without deleting it.\n4. **Locations API** — manage your stock locations. The location `code` is immutable after creation.\n5. **Categories API** — the list of allowed category titles an import may reference.\n6. **Webhook settings** — register an HTTPS endpoint + secret to receive signed `import.completed` / `import.failed` notifications. Payloads are signed with `X-GoSource-Signature: sha256=<HMAC-SHA256(body, secret)>`; deliveries are retried with exponential backoff (up to 6 attempts spanning over an hour).\n\n## Conventions\n\n- **Auth**: every request carries `Authorization: Token <your API token>`. Request a token from our support team.\n- **Errors**: all client errors are RFC 9457 problem-details documents (`application/problem+json`) with `type`, `title`, `status`, `detail`, and an `errors[]` array carrying field-/row-level detail. Payloads with unknown fields are rejected, naming the fields.\n- **Rate limits**: requests are limited per vendor; a `429` response includes a `Retry-After` header.\n- **Pagination**: list endpoints use cursor pagination (`cursor`, `page_size` params; follow the `next` link) ordered by modification time, and support delta sync via `modified_since=<ISO 8601 datetime>`.\n\nQuestions? Our support team is happy to help you 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