Shopify-Etsy-TikTok Integration Setup

I need someone who can technically connect my existing Shopify store to both Etsy and TikTok Shop so every one of my products is automatically available on those platforms. The main objective is to expand customer reach, not just duplicate listings, so the integration must sync inventory, pricing, variants and order flow in real time.

Scope of work
• Configure the official sales channels or the most reliable third-party apps to publish all products from Shopify to Etsy and TikTok Shop.
• Map categories, attributes and shipping profiles correctly so listings are approved without errors.
• Ensure inventory, stock counts and order tracking update seamlessly in both directions.
• Walk me through any API keys, permissions or marketplace settings I have to approve.
• Provide a quick reference guide or short video showing how to add future products and troubleshoot common sync issues.

Acceptance criteria
• All current Shopify products visible and purchasable on Etsy and TikTok Shop.
• No duplicate SKUs or overselling during a live test order.
• Sync runs automatically without manual intervention for 48 hours.

If you have hands-on experience integrating these exact channels and can complete the technical setup quickly, please let me know your estimated timeline and any app or connector costs I should expect.