What features and roles have you encountered in system integration design?

When designing integrations, I often encounter the following features:

• Different protocols and data formats: systems may use REST, SOAP, MQ, files, and data formats like JSON, XML, CSV, etc.
• Error handling and fault tolerance: it is important to plan for retries, logging, and notifications in case of failures.
• Data consistency: in asynchronous integrations, issues of eventual consistency and conflicts need to be addressed.
• Security: authentication, authorization, and data encryption during transmission.
• Performance and scalability: integration should not create bottlenecks.
• API versioning: to avoid breaking existing consumers during updates.
• Monitoring and tracing: to quickly identify and resolve issues.

For example, when integrating CRM and ERP, it is important to consider that customer updates may arrive with delays, and it is necessary to correctly handle duplicates and data conflicts.