Submit a bulk JSON_LISTINGS_FEED via Amazon SP-API Feeds API to create or update many listings at once

Steps

1. Call POST /feeds/2021-06-30/documents to create an upload document; the response contains an uploadDestination.url (a pre-signed S3 URL) and a feedDocumentId.
2. Build your JSON feed payload conforming to the JSON_LISTINGS_FEED schema — each record is a JSON Patch document keyed by SKU with a 'patches' array of attribute operations.
3. PUT the compressed (gzip) feed content directly to the pre-signed S3 URL with Content-Type application/octet-stream; no Authorization header is needed for this PUT.
4. Create the feed by calling POST /feeds/2021-06-30/feeds with body {feedType: 'JSON_LISTINGS_FEED', marketplaceIds: [...], inputFeedDocumentId: feedDocumentId}.
5. Poll GET /feeds/2021-06-30/feeds/{feedId} until processingStatus reaches 'DONE'; then retrieve the result document URL from the feed's resultFeedDocumentId.
6. Download, decompress, and parse the processing report — each record contains a 'status' ('ACCEPTED' or 'INVALID') and an 'issues' array with error codes and details for any rejected items.