A Detailed Look at Migrating a Large User Base to a Custom Billing Solution

The blog post outlines a four-year project aimed at migrating 600,000+ users from Chargebee to an in-house billing service called Charger for Steady, a platform that supports Media Makers. Initially, their reliance on Chargebee created limitations, prompting the need for a custom solution. The migration involved meticulously building schemas, API endpoints, and a transition plan that allowed for testing with a small batch of users to ensure data integrity and system stability. Job processing was managed with Oban, allowing for effective migration tasks while addressing challenges like data validation and rate limits from Chargebee. The phased migration strategy started with 10 users and gradually increased in scale, ensuring collaboration and thorough testing throughout the process.