E-commerce Migration to Shopify or LearnWorlds

I need to migrate my e-commerce store from http://certyfikaty.de/ to either Shopify or LearnWorlds.

Essential Features:
- Product Reviews
- Payment Gateways
- Inventory Management

Ideal Skills & Experience:
- Proven experience with Shopify or LearnWorlds
- Strong background in e-commerce site migration
- Familiarity with setting up and managing product reviews, payment gateways, and inventory systems

Please provide samples of similar work done.