Deep Dives24 min read
How to Migrate Subscribers from a Legacy Billing System Without Downtime
A successful **subscription billing migration** should be boring to customers and calm for finance. You are not just moving records out of a legacy system. You are changing who can create charges, where invoice truth lives, and how finance will trust the first close. Done well, the move is largely invisible to customers, designed to avoid duplicate charging, and uneventful for the teams who have to run it.
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