Checkout Detective User Guide

Checkout was initiated and reached the final payment step, but no completed purchase event was detected on order confirmation.

The customer clicked the checkout button, but the store failed to redirect to checkout.

Add to Cart action occurred, but the cart item count badge remained at 0.

Add to Cart completed successfully, but the slide cart drawer or popup modal failed to appear.

Redirected to checkout but checkout session tokens or security parameters were stripped.

Investigation concluded after reaching the payment screen without placing a real order.

Customer clicked the checkout button repeatedly in under 1 second due to a missing loading state.

Checkout started directly from a Buy Now button without passing through the cart.

Checkout progression stopped because an item in the cart is depleted in inventory.

Cart total is $0.00 (e.g. 100% discount code) and checkout hung during payment setup.

Meta Pixel fired AddToCart 2 or more times for a single click within 2.0 seconds.

Meta Pixel Purchase event fired multiple times for this single order, doubling reported ROAS.

No Meta Pixel was detected on the store or ad-blockers blocked the tracking tag.

Customer entered checkout, but Meta Pixel InitiateCheckout event did not fire.

Meta Purchase event fired without a valid monetary value or currency code.

More than one distinct Meta Pixel ID is firing events simultaneously on the storefront.

Product page was visited but Meta ViewContent did not fire.

Meta tracking requests to facebook.com/tr were blocked by browser security or ad-blockers.

Google Analytics received multiple add_to_cart events for a single click.

Customer entered checkout, but GA4 begin_checkout event was not recorded.

Order confirmation was reached, but GA4 purchase event was missing.

window.dataLayer was reset or initialized incorrectly as an object instead of an array.

GA4 purchase event emitted without a unique transaction_id parameter.

Google Ads conversion event lacks currency code parameter.

Multiple Google Analytics Measurement IDs (G-XXXXX) are loaded simultaneously.

GA4 begin_checkout was sent with an empty items: [] array.

Shopify Cart endpoint returned HTTP 422 Unprocessable Entity.

Shopify Cart endpoint returned HTTP 500 Internal Server Error.

Analytics or tracking server returned HTTP 403 Forbidden.

Payment gateway or checkout session timed out (>5000ms latency).

A critical checkout or tracking request was blocked by browser security policy.

Cart operation took longer than 2.5 seconds to complete.

Cart request was blocked due to missing Access-Control-Allow-Origin.

Currency conversion service failed to respond with exchange rates.

A JavaScript runtime error occurred within 1500ms of clicking Checkout.

A JavaScript runtime error occurred immediately when adding an item to cart.

An event listener prevented checkout form submission but failed to trigger manual redirect.

An unhandled asynchronous Promise rejection occurred in the browser.

Checkout button remained disabled permanently without navigating.

A script threw "$ is not defined" or "Shopify is not defined".

More than 3 separate click listeners are bound to the checkout button.

More than 5 distinct JavaScript errors fired during this checkout session.

Marketing campaign UTM parameters were lost during navigation to checkout.

Currency displayed on product page differs from currency passed to cart or checkout.

Discount applied in cart was not carried over to checkout URL.

Store locale shifted unexpectedly during checkout navigation.

Store loads more than 15 distinct third-party services during checkout.

An external app script returned HTTP 404 or 500 error.

Third-party app script generated multiple errors and latency.

A third-party script delayed navigation or page rendering by over 1.5 seconds.