Polling & best practices

Recommended intervals

Feed	Interval	Notes
Update	Once an hour	Pricing, promos and branch stock. Comfortably fresh for trading without hammering the feeds
Full	Once a day, off-peak	Product content, images, categories and attributes. Schedule outside business hours — overnight is ideal

Stagger your two jobs rather than firing them together, and avoid scheduling exactly on the hour if you can, an offset like :17 spreads load across all resellers.

Recommended pattern

Run your sync server-side with a real cron job on your host, not via page-visit triggers, it runs reliably regardless of your site's traffic.
Use the update feed for the hourly price and stock refresh, and the full feed for the daily content reconciliation.
Download one feed at a time per account — parallel downloads of multiple feeds from the same account don't make your data fresher.
Handle a temporarily unavailable feed gracefully — retry with backoff rather than in a tight loop.
Verify a download parsed completely (compare against the envelope's count) before acting on products that appear to be missing. See Delisted products.