How do I sync Magento to Tori.fi, Verkkokauppa.com, and Gigantti?

Three different marketplace patterns in Finland:

• Tori.fi, Finland’s biggest C2C marketplace (Schibsted-owned, like a Finnish eBay). Increasingly used for B2C overstock + refurb. Integration via Tori Pro API: product feeds (XML), inventory sync, lead/message routing back to Magento. Good for fashion / electronics / furniture.
• Verkkokauppa.com, Finland’s #1 online electronics retailer. They run a marketplace for third-party sellers (similar to Amazon Marketplace). Integration: product feed, stock sync, order intake via their seller API. Higher fees but huge audience (~80% of FI knows Verkkokauppa).
• Gigantti / Power, big-box electronics chains, mostly closed marketplaces (you negotiate as a wholesaler, not as a third-party). We help build the EDI / e-invoice pipeline from Magento → their procurement system.
• Other Nordic marketplaces, Cdon (SE), Elkjop (NO/DK), Komplett (NO/SE), Hobbyhall (FI niche).

Magento integration approach: use a connector module (M2E Pro for Amazon/eBay, custom for FI marketplaces) to push product + stock feeds, listen for orders via webhook, sync shipment + tracking back. We’ve built FI-specific feeds for Tori, Verkkokauppa, and several niche category leaders.