Payment integration package diagram
A payment integration package diagram separates the checkout experience from payment orchestration and the external gateway. It also makes the asynchronous webhook path visible, which is important because a payment result may arrive after the original request. A ledger package records the business outcome without exposing its details to the checkout package. Use this diagram in an implementation review to check that provider-specific code stays behind an adapter and that callback handling has an explicit place.
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Scenario
A team documents the boundary between checkout and an external payment provider.
Key decisions
- Separate orchestration: Checkout requests payment without owning gateway details.
- Contain the provider: Keep gateway calls inside an adapter package.
- Handle callbacks: Treat webhooks as a distinct inbound boundary.
- Record outcomes: Update the ledger from verified payment events.
When to reuse this
Use to review responsibilities and dependencies before implementing payment flows.
Frequently asked questions
Why isolate the gateway adapter?
Why show webhooks separately?
Is this a sequence diagram?
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