The original title is: "Your Architecture Isn't Provider-Neutral Until the Second Provider Ships."

Short summary

Architectures appear provider-neutral until you add a second external provider and discover hidden assumptions everywhere. The solution is to isolate the shared orchestration layer from provider-specific adapters, using provider-agnostic sync items as units of work. This pattern keeps marketplace logic independent of any single commerce platform's API quirks.

• •Single-provider integrations mask architectural assumptions that break when scaling to multiple providers
• •Adapter pattern with shared lifecycle layer provides stable boundaries between orchestration and provider specifics
• •Provider-agnostic sync items prevent platform APIs from leaking into the domain model

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