Add cohort purchasers to the marketing subscribers list

Completed checkouts without subscriber entries delay welcome messages and leave audiences incomplete. It adds purchasers to a cohort list so marketing can start onboarding same day.

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Overview

Stop waiting for manual imports when purchases occur — feed checkout events straight into the cohort subscriber list so campaigns run on schedule. With IT-owned ingestion, marketing can kick off welcome and onboarding flows the same day, reducing missed outreach windows and ensuring program consistency.