Most migrations move the data and leave you to rebuild the storefront. That rebuild is the part that actually costs weeks, so it is the part this covers.

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Translate the theme

The CLI reads a theme you already have and writes a Mercemur storefront from it.
Nothing is live until you publish, so you can push, look at the preview, and push again without a shopper seeing a half-migrated storefront.
The translation is built from Dawn and Horizon, Shopify’s own reference themes. A theme derived from either translates well. A heavily customised commercial theme will translate partially, and mercemur theme check tells you which sections before you commit to anything.
See Theme workflow for the full command set.

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Bring the catalogue

Products, variants, collections, customers and orders come across through the import path rather than by hand. What matters afterwards is the check, not the import: run your top sellers and your most complicated variant setups first, because those are where a mapping difference shows up.

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What does not come across

Be realistic about these up front rather than discovering them at launch:
  • Apps and their embedded scripts have no equivalent. Find the Mercemur feature, or the integration, that replaces each one.
  • Discount logic written as a Shopify Script needs rebuilding as a promotion.
  • Anything a theme did through a Shopify-only Liquid object will be flagged by theme check rather than silently dropped.

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Finish the job

Do not point DNS at the new storefront until you have placed a real paid order on it. A free or zero-total order exercises none of the payment path.
  1. Connect a payment provider and place a real order.
  2. Check your highest-traffic pages render, especially the product page.
  3. Set up redirects for any URL that changes, so search results keep working.

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Reference

  • Theme workflow for pull, check, push, publish and live preview.
  • The Storefront tab for templates, sections and redirects.
  • MCP if you would rather adjust the storefront by asking an assistant.