You must pick the lowest-risk first microservice to migrate from an ecommerce monolith to cloud-based microservices. Which functionality should you migrate first?

Migrating the product catalog first is the lowest risk because it has relatively contained dependencies. It primarily interacts with the frontend for display and a product database for data retrieval. While essential, its failure would impact product browsing but not directly lead to financial loss or unfulfilled orders. In contrast, payment processing involves sensitive financial transactions and external vendors, making it high risk. Order fulfillment is complex, involving inventory and shipping, directly impacting customer satisfaction and logistics. The shopping cart integrates with multiple critical systems, including payment processing and inventory, making it a high-risk, high-impact component to migrate early. Starting with a less interconnected and less business-critical service allows the team to gain experience with microservice deployment and management with minimal impact on core business operations.