Why SaaS Companies Are Separating Billing Engines from Payment Gateways

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As SaaS products scale, billing logic grows far more complex than simple payment collection, requiring support for usage-based pricing, tiered plans, prepaid credits, and flexible subscriptions. Engineering teams increasingly find themselves maintaining sprawling billing code—cron jobs, invoice generators, and reconciliation systems—instead of building core product features. To address this, a growing number of software companies are adopting a layered architecture that separates a dedicated billing platform from the underlying payment gateway. Platforms like AoraHQ exemplify this approach, acting as a billing orchestration layer that handles pricing, invoicing, and subscription management while letting businesses connect their own payment providers via a 'Bring Your Own Keys' model. This separation aims to reduce vendor lock-in, simplify maintenance, and give engineering teams more flexibility when pricing models evolve.

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