# Install the SDK **Category:** [Platform Messaging](https://help.totalctrl.app/hc/totalctrl/totalctrl-help-center/en-US/categories/product-tours) **Updated:** 2026-08-19 ## Install the Platform Messaging SDK - Open **Platform Messaging → Install**. - Copy the snippet and paste it into the `` of every page of your product. - (Recommended) Call `tcMessaging('identify', userId, traits)` with your logged-in user's id and properties so you can target by audience and resume tours across devices: ``` tcMessaging('identify', 'user-123', { plan: 'pro', role: 'admin' }); ``` ### Allowed origins On the Install page you can list the domains allowed to send events. Leave it blank to accept any origin, or restrict it to your production domains. ### Verify it works Publish a simple banner flow targeted at any page, load your site, and confirm it appears. The Install page shows your public **site key**; it is safe to expose in client-side code. --- ## Related Articles - [Build a tour](https://help.totalctrl.app/en-US/articles/build-a-tour) - [Measure performance](https://help.totalctrl.app/en-US/articles/platform-messaging-analytics) - [Targeting, triggers, and frequency](https://help.totalctrl.app/en-US/articles/targeting-triggers-frequency) - [Onboarding checklists](https://help.totalctrl.app/en-US/articles/onboarding-checklists) - [Draft a flow with AI](https://help.totalctrl.app/en-US/articles/draft-a-flow-with-ai) --- [← Back to TotalCtrl Help Center](https://help.totalctrl.app/en-US/)