The challenges of integrating products are often underestimated, requiring more than just a few API calls to maintain them. Integrating data from various APIs can be particularly difficult due to issues such as task orchestration, resilient long-running tasks, and two-way syncing. Exceeding API rate limits can also disrupt integrations, with detection, retries, and avoiding penalties being key challenges. Additionally, APIs structure data differently, requiring validation to prevent integration failures, while growth increases complexity through resource management, storage optimization, concurrency control, failure handling, and performance tuning. Reliably monitoring integrations is also crucial for strong observability, involving comprehensive failure tracking, performance monitoring, rate-limit monitoring, network traffic logging, data quality monitoring, and customer-specific debugging. By addressing these challenges early, teams can prevent costly surprises down the line and ensure robust infrastructure for their integrations.