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docs/architecture/adr-payment-boundary.md

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+# ADR for Payment Boundary 
+
+## Context
+
+The payment processing system is essential for managing transactions securely and efficiently. In defining the boundaries of our payment application, we must understand the various components it interacts with and the responsibilities of each. 
+
+## Decision
+
+We will define a clear boundary for the payment processing system that encapsulates all the logic required for handling payment transactions, without leaking details to external systems. This provides a layer of security and abstraction that will help maintain the integrity of transaction data. 
+
+## Alternatives
+
+1. **Single Responsibility Service:** Create a dedicated payment service that handles all aspects of payment processing.  
+   - *Pros:* Simple architecture, clear boundaries.
+   - *Cons:* Potential bottleneck as all requests funnel through one service.
+
+2. **Microservices Approach:** Distribute payment logic across multiple microservices, each handling a specific function (e.g., fraud detection, payment gateway integration, transaction logging).
+   - *Pros:* Scalable, services can be developed and deployed independently.
+   - *Cons:* Increased complexity in service orchestration and communication.
+
+3. **Hybrid Model:** Combine both approaches where core functionalities reside in a single service while auxiliary functions are handled by microservices.  
+   - *Pros:* Balances simplicity and flexibility.
+   - *Cons:* May introduce complexity in terms of interaction between services.
+
+## Consequences
+
+- Selecting the Single Responsibility Service may limit scalability and lead to performance issues under heavy load.
+- The Microservices Approach could overcomplicate deployment and require robust infrastructure for managing inter-service communication and data consistency.
+- The Hybrid Model serves as a compromise but requires careful design to avoid pitfalls of both extremes and ensure clear interfaces between different components.