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docs/architecture/adr-payment-boundary.md

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+# Architectural Decision Record (ADR) for Payment Boundary
+
+## Context
+In the context of our system architecture, we need to define the boundaries within which payment transactions operate. This is crucial for ensuring security, compliance, and efficiency in processing payments. Our goal is to create a robust and flexible payment service that interacts seamlessly with other components of the architecture while maintaining clear boundaries.
+
+## Decision
+We have decided to encapsulate all payment-related functionalities within a dedicated payment service. This service will be responsible for handling the logic for initiating payments, processing payment notifications, and managing payment feedback from external payment gateways. The payment service will expose a set of APIs that other parts of the system can interact with, ensuring loose coupling and clear separation of responsibilities.
+
+## Alternatives
+1. **Single monolithic service** for handling payments together with order management and other business logic: This approach could lead to tighter coupling and reduced flexibility in scaling or modifying the payment logic.
+2. **Multiple microservices** for different payment gateways: This would split the payment service into smaller units based on different payment providers, increasing complexity and deployment overhead.
+
+## Consequences
+By adopting a dedicated payment service:
+- We ensure that all payment-related logic is centralized, simplifying future changes and scalability.
+- We can integrate new payment methods with minimal impact on the overall system.
+- It may require additional development effort to define the API and service contracts but will pay off with a cleaner architecture.
+