Registers up to 100 sellers in a single request. Each row is upserted by external_reference_id, with the same semantics as the single-seller endpoint: existing rows are updated, new rows are inserted.

The response always returns 200 OK with a per-row status of created, updated, or error. Use total_created, total_updated, and total_errors for at-a-glance counts.

Validation is all-or-nothing for missing or malformed fields: if any row fails schema validation (required fields, format rules, etc.) the whole batch is rejected with 400 or 422. Per-row error statuses are reserved for downstream persistence failures after schema validation has passed.

Validation error responses include the offending row index in the response keys (e.g. sellers[3].company_address.address_line1) so you can identify which row failed.