How does the Pinterest API for Conversions complement the Pinterest Tag?

The Pinterest API for Conversions (also known as CAPI) is a server-to-server integration that serves as a modern, more resilient partner to the standard Pinterest Tag. While the Tag relies on a user's web browser to function, CAPI works in the background between your website's server and Pinterest. Bypassing Browser Limitations: Traditional tracking (like the Pinterest Tag) is increasingly hindered by ad blockers, cookie restrictions, and privacy features like Apple's Intelligent Tracking Prevention (ITP). Because CAPI sends data directly from your server, it is not affected by these browser-level limitations. Improved Accuracy: By using both the Tag and CAPI together, you create a "safety net." If the browser tag fails to fire or is blocked, the API can still send the conversion event, ensuring your ROAS and attribution data remain accurate. Better Optimization: CAPI allows you to share more high-quality, first-party data (like hashed emails or phone numbers). This provides Pinterest's algorithm with stronger signals to find "high-intent" users who are most likely to buy, leading to lower costs per acquisition (CPA). Automatic Deduplication: When you use both methods, Pinterest uses an event_id to recognize if the same action was reported by both the Tag and the API, ensuring you don't double-count your sales.