Implement GTM & Event Tracking and work with Our Developer to completely implement it

I need Google Tag Manager installed from scratch on a custom-built HTML/CSS/JS site and configured so that I can finally see the actions that matter inside Google Analytics 4. The two events I must capture right away are:

• Button Clicks – every primary CTA across the site
• Payment Processed – a single conversion event that fires after a successful checkout

Once GTM is live, the container should include all necessary tags, triggers and variables, with a tidy workspace and clear naming conventions. Please link the setup to my existing GA4 property, publish in the live environment, and supply a brief hand-off doc or Loom walkthrough so I can verify and maintain the configuration.

Acceptance criteria
• Both events appear in the GA4 DebugView and Real-Time reports without duplicates
• No console errors or layout shifts caused by the GTM snippet
• All work validated in an incognito session before delivery

If additional dataLayer pushes are required for the Payment Processed event, outline exactly what I need to add to the checkout page.