Billing System Migration: The Complete Playbook for Replacing Legacy Systems

Migrating from a legacy billing system to a modern platform is a crucial yet risky endeavor for SaaS companies, aiming to improve cash flow, reduce billing errors, and enhance pricing strategies. This comprehensive guide outlines a six-phase migration playbook, covering assessment, platform selection, architecture, parallel run, full cutover, and optimization, with detailed strategies to preserve historical billing data and ensure operational continuity. It highlights the importance of using open-source billing platforms like Lago, which provide transparency, control, and flexibility, reducing vendor lock-in and enabling faster pricing launches. The guide emphasizes the need for disciplined planning, rigorous validation, and phased execution to avoid common pitfalls such as data complexity underestimation and insufficient edge-case testing, while also illustrating successful migration through a B2B fintech case study, demonstrating significant reductions in engineering time and processing fees.

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