# ADR for Payment Boundary

## Context
This document provides the Architectural Decision Record (ADR) for defining the payment boundary within the project's architecture. The objective is to create a clear demarcation of responsibilities related to payment processing, ensuring that all payment-related functionalities are encapsulated and modular.

## Decision
We have decided to adopt a microservices architecture for the payment processing functionality. The payment service will handle all interactions related to payment transactions, including validation, processing, and integration with third-party payment providers.

## Alternatives
1. **Monolithic Architecture**: We could have developed the payment processing functionality as a part of the existing monolithic application. However, this would lead to tight coupling and reduced scalability.
2. **Serverless Architecture**: Another alternative was to implement the payment service using serverless functions. This would provide ease of scaling but at the cost of increased complexity in managing state and transactions.

## Consequences
By selecting a microservices architecture, we ensure scalability and flexibility in deploying updates to the payment service independently. However, this approach may introduce challenges related to inter-service communication and require robust monitoring and logging mechanisms to track payment transaction flows.