Email and marketing automation migration to Shopify

During discovery, build the explicit inventory: every active flow with its trigger event, every segment with its definition logic, every transactional email with its template owner, every integration with its data dependency. Most $5M+ brands have 30-100 active flows and 50+ segment definitions, all of which need explicit handling.

The inventory exercise often surfaces flow complexity the team has lost track of. Flows that fire monthly produce real revenue but rarely get reviewed; flow audit work is almost always under-scoped because the team underestimates how much of it exists.

Klaviyo, Mailchimp, and Attentive all integrate cleanly with Shopify, but the integration uses Shopify's native event schema — different from the source platform's. Each flow trigger needs explicit re-wiring to the equivalent Shopify event. Some flows map one-to-one; some need restructuring; some retire because they relied on source-platform-specific events.

The re-wiring work happens before launch on the staging Shopify environment. Test each flow with synthetic customer events to verify firing. Brands that skip the staging testing consistently discover broken flows post-launch as missed revenue rather than as caught issues.

Shopify's default transactional emails are functional but generic. For $5M+ brands, customise every transactional email (order confirmation, shipping notification, refund confirmation, return updates) to match the brand voice and visual identity. The work is operationally small but materially affects customer-experience continuity through the migration.

For brands using Klaviyo or similar for transactional emails (rather than Shopify's built-in), the source-platform transactional templates need migration to the new event triggers. The work is similar to flow migration; treat it as part of the email migration workstream rather than as a separate item.

Attribution data is what enables growth decisions; losing it through the migration affects marketing ROI for quarters. Coordinate the cutover with the marketing analytics platform (Klaviyo, GA4, Triple Whale) to preserve attribution windows where possible. For the windows that cannot survive cutover cleanly, document the attribution gap explicitly so downstream reporting can adjust.

For brands with sophisticated multi-touch attribution, the work extends beyond email to include the broader analytics stack. Plan this as a separate workstream involving the growth team; treating it as a sub-task of email migration consistently under-scopes the analytics work.

Sender reputation does not transfer cleanly between platforms. The first weeks of sending from the new platform configuration may see lower deliverability while ESPs evaluate the new sender. Plan a gradual ramp: low volume first, increasing over two to four weeks. Avoid sending the largest campaigns in the first two weeks post-launch.

Brands that ignore sender warming send their largest campaigns first and see deliverability drops that take months to recover. The warming discipline is the same one new senders use; migration sends the same constraint despite the brand having long-standing sender history.