How to use the Webflow custom code API to push scripts to specific pages

Webflow's Custom Code API enables developers to register scripts at the site level and apply them to specific pages programmatically, bypassing the need for the Designer interface. This approach is particularly useful for deploying tracking pixels, debugging utilities, or analytics tags at scale. The process involves two main phases: site-level registration and page-level application, utilizing a GET-before-PUT pattern to prevent data loss. Key requirements include a Webflow App with OAuth authorization, site ID, target page IDs, and the script content, with a particular emphasis on using OAuth tokens over site tokens due to API access restrictions. Developers must ensure scripts are not duplicated on pages and handle common issues like credential misconfigurations, destructive PUT operations, SRI hash mismatches, and script ID collisions. The guide provides detailed instructions on the workflow, including fetching current scripts, checking for duplicates, merging new scripts, and handling potential failure modes, ultimately enabling efficient and scalable script management across Webflow sites.