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POST /PowderCatalog/ImportApi accepts the JSON scrape format in the request body, authenticated by a shared secret in the X-Import-Token header (matched constant-time against CatalogImport:Token), with the vendor in X-Vendor-Name. Runs through the same ImportJsonAsync -> shared upsert as the manual upload, so the offline PrismaticSync tool can push unattended. ImportJsonAsync refactored to take a Stream (the form upload now passes file.OpenReadStream()). Endpoint is AllowAnonymous + IgnoreAntiforgeryToken (it's token-gated, not cookie-auth) and returns 401 until a token is configured, so it's inert by default. README updated with the route + token wiring. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>