# Architecture Decision Record: Payment Boundary

## Context
In the context of transitioning to a new payment system, we need to define clear boundaries within our architecture to ensure proper integration and maintainability. This decision will outline the approach we take to isolate the payment processing components from other parts of the application.

## Decision
We decide to encapsulate all payment-related operations within a dedicated Payment Service. This service will handle transactions, manage payment methods, and interact with third-party payment gateways. The service will expose a RESTful API to other services that require payment processing.

## Alternatives
1. **Integrate payment processing directly within existing services**: This would lead to tightly coupled code with potential for increased complexity and difficulty in maintenance.
2. **Use a microservices approach for every payment operation**: While this increases modularity, it may also introduce excessive complexity and communication overhead between services.

## Consequences
- **Pros**: Clear boundaries will improve maintainability, making it easier to reason about the payment process as a distinct component. This separation allows for independent scaling and potential future integration with different payment systems.
- **Cons**: Requires an initial investment in creating the boundary and service infrastructure, potentially increasing the upfront complexity during the migration phase.