{"id":11364,"date":"2025-12-16T12:01:45","date_gmt":"2025-12-16T06:31:45","guid":{"rendered":"https:\/\/easyinsights.ai\/blog\/?p=11364"},"modified":"2025-12-16T12:01:47","modified_gmt":"2025-12-16T06:31:47","slug":"why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end","status":"publish","type":"post","link":"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/","title":{"rendered":"Why Multi-Domain Checkouts Break Tracking and How to Reconnect Event Flows End-to-End"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/1200x628-2-1024x536.png\" alt=\"x ()\" class=\"wp-image-11368\" srcset=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/1200x628-2-1024x536.png 1024w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/1200x628-2-300x157.png 300w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/1200x628-2-768x402.png 768w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/1200x628-2.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Every time your user jumps from your main website to a third-party payment domain &#8211; Shopify, Razorpay, PayPal, WooCommerce Subdomains, or custom checkout engines &#8211; your analytics platform treats it as if a brand-new user just appeared out of nowhere. The result? Broken user journeys, inflated sessions, lost source\/medium, and a completely scrambled understanding of what\u2019s actually driving revenue. <\/p>\n\n\n\n<p>For performance marketers, this is more than a technical nuisance. It is a <strong>direct attack on your ability to optimize, scale, and trust your own numbers<\/strong>.<\/p>\n\n\n\n<p>In this blog, we\u2019ll break down <strong>why multi-domain checkouts disrupt tracking<\/strong>, how they sever the event flow between your marketing channels and your backend logic, and &#8211; most importantly &#8211; <strong>how to rebuild a clean, end-to-end measurement system<\/strong> that ties every click to every cart, checkout, and purchase.<\/p>\n\n\n\n<p>Because in a world where data accuracy powers every decision, reconnecting your event flow isn\u2019t optional &#8211; it\u2019s your competitive edge.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Jump ahead to:<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#How_Multi-Domain_Checkouts_break_Tracking\" >How Multi-Domain Checkouts break Tracking<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#Why_this_happens_%E2%80%93_the_technical_root_causes\" >Why this happens &#8211; the technical root causes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#Consequences_Lost_Conversions_and_Skewed_Metrics\" >Consequences: Lost Conversions and Skewed Metrics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#Fixing_Cross-Domain_Tracking\" >Fixing Cross-Domain Tracking<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#First-Party_and_Server-Side_Tracking\" >First-Party and Server-Side Tracking<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#How_to_Reconnect_Event_Flows_End-to-End_Across_Multi-Domain\" >How to Reconnect Event Flows End-to-End Across Multi-Domain<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#How_EasyInsights_Fixes_Multi-Domain_Tracking\" >How EasyInsights Fixes Multi-Domain Tracking<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/easyinsights.ai\/blog\/why-multi-domain-checkouts-break-tracking-and-how-to-reconnect-event-flows-end-to-end\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Multi-Domain_Checkouts_break_Tracking\"><\/span>How Multi-Domain Checkouts break Tracking<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Multi-domain checkouts break your tracking because analytics tools &#8211; which rely heavily on first-party cookies &#8211; see every new domain as a brand-new session and a brand-new user. This splits the user journey, inflates metrics, and makes your data unreliable.<\/p>\n\n\n\n<p>To fix this, GA4 uses cross-domain tracking: you connect all domains under the same GA4 property and configure them in GA4 and GTM so they pass a shared user identifier (like the _gl parameter) across domains, keeping the session and user consistent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_this_happens_%E2%80%93_the_technical_root_causes\"><\/span>Why this happens &#8211; the technical root causes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>1. Cookies are domain-scoped and browsers enforce isolation<\/strong><\/p>\n\n\n\n<p>Cookies set on example.com aren\u2019t accessible to checkout-store.com. That means client identifiers (GA cookie, first-party IDs) don\u2019t travel automatically across domains, so analytics can\u2019t stitch clicks to conversions. Modern browsers also restrict cross-site cookie sending via SameSite rules and third-party cookie blocking, which makes naive cross-domain approaches brittle.<\/p>\n\n\n\n<p><strong>2. Redirects and referrer loss break link decoration<\/strong><\/p>\n\n\n\n<p>Many cross-domain solutions rely on link decoration (attaching a client id or _gl parameter to the URL). Redirects, intermediate URLs, or improper server responses can strip or fail to forward those parameters &#8211; and once you lose that identifier, the checkout domain thinks the visitor is new. GA4 supports link decoration, but it must be correctly configured on <em>every<\/em> domain in the flow. <a href=\"https:\/\/support.google.com\/analytics\/answer\/10071811?hl=en&amp;utm_source=chatgpt.com\">Google Help<\/a><\/p>\n\n\n\n<p><strong>3. Client-side tracking is fragile and privacy-sensitive<\/strong><\/p>\n\n\n\n<p>Client-side pixels depend on the browser to run JavaScript and send events. Ad blockers, privacy settings, and network issues can prevent those events from firing. That leaves server-side events (order confirmations from your backend) as the only reliable source &#8211; but mixing client and server events without deduplication creates duplicates. <a href=\"https:\/\/support.google.com\/tagmanager\/answer\/13387731?hl=en&amp;utm_source=chatgpt.com\">Google Hel<\/a>p<\/p>\n\n\n\n<p><strong>4. Duplicate events and attribution mismatches<\/strong><\/p>\n\n\n\n<p>If your <a href=\"https:\/\/easyinsights.ai\/blog\/meta-pixel-vs-google-analytics-4-a-detailed-comparison\/\">pixel<\/a> fires in the browser <strong>and<\/strong> your server sends a postback for the same purchase, ad platforms may count it twice unless you match and deduplicate using a shared event_id and the platform\u2019s deduplication mechanism. Failing to deduplicate distorts CPA, ROAS, and optimization signals.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Consequences_Lost_Conversions_and_Skewed_Metrics\"><\/span>Consequences: Lost Conversions and Skewed Metrics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When analytics sessions break between domains, data gets distorted. Conversions (like a purchase or signup) happening on the checkout domain may not be tied to the original session. GA4 might attribute that sale to \u201cDirect\u201d or the wrong channel, hiding what really drove it<br><br>The first site sees a bounce (user left), and the checkout site sees an orphaned visit. This can inflate bounce rates and double-count users.<\/p>\n\n\n\n<p>EasyInsights notes that without cross-domain tracking a lead form on a subdomain was being logged as a new visit with no referrer. Marketing touchpoints (Google Ads, Facebook, etc.) were lost, and the lead showed up as \u201cDirect,\u201d causing <em>\u201c <\/em>inflated user sessions &amp; broken referral paths<em>\u201d<\/em><\/p>\n\n\n\n<p>In practice, you\u2019ll see conversions under a generic channel and your ROAS and funnel metrics go off, making budgets and optimizations unreliable.<\/p>\n\n\n\n<p><strong>Also read<\/strong>: <a href=\"https:\/\/easyinsights.ai\/blog\/multitouch-attribution-in-customer-purchase-journey\/\">Multitouch Attribution in Customer Purchase journey\u00a0<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fixing_Cross-Domain_Tracking\"><\/span>Fixing Cross-Domain Tracking<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The good news is these breaks can be fixed. The primary solution is to <strong>enable cross-domain tracking<\/strong> so the user\u2019s GA4 client ID is passed between domains. In GA4 this is done in the Admin settings:&nbsp;<\/p>\n\n\n\n<p>go to <strong>Admin &gt; Data Streams &gt; [Your Web Data Stream] &gt; Configure tag settings &gt; Configure your domains<\/strong>.&nbsp;<\/p>\n\n\n\n<p>There, add all related domains (e.g. myshop.com and checkout.partner.com) for the same GA4 property <a href=\"https:\/\/support.google.com\/analytics\/answer\/10071811?hl=en#:~:text=2,Choose%20a%20match%20type\">support.google.com<\/a>.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"434\" src=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1-1024x434.png\" alt=\"image\" class=\"wp-image-11366\" srcset=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1-1024x434.png 1024w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1-300x127.png 300w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1-768x325.png 768w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1-1536x650.png 1536w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1.png 1540w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"581\" src=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-2-1024x581.png\" alt=\"image\" class=\"wp-image-11367\" srcset=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-2-1024x581.png 1024w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-2-300x170.png 300w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-2-768x436.png 768w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-2.png 1492w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>GA4 will then automatically append a special _gl linker parameter (holding the client\/session ID) to links between those domains.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"331\" src=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1024x331.png\" alt=\"image\" class=\"wp-image-11365\" srcset=\"https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-1024x331.png 1024w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-300x97.png 300w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image-768x248.png 768w, https:\/\/easyinsights.ai\/easyinsights_wordpress\/wp-content\/uploads\/2025\/12\/image.png 1151w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"First-Party_and_Server-Side_Tracking\"><\/span>First-Party and Server-Side Tracking<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For robust data, consider moving more tracking into first-party or server-side systems. <strong>First-party tracking<\/strong> means using your own domain for cookies (e.g. hosting the checkout on a subdomain of your site) or employing browser fingerprinting so a user can be recognized across domains without relying solely on cookies. EasyInsights, for example, uses a pixel and \u201c<a href=\"https:\/\/easyinsights.ai\/blog\/what-is-digital-fingerprinting\/\">digital fingerprinting<\/a>\u201d to identify users across domains<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/easyinsights.ai\/blog\/server-side-tracking-and-client-side-tracking\/\">Server-side tagging<\/a><\/strong> is another advanced fix. In this setup, instead of the browser sending hits to GA, your server captures events (like a purchase) and forwards them to GA or other analytics. Because this happens behind the scenes, browser cookie restrictions (or domain changes) don\u2019t interrupt it. Google\u2019s GTM Server container or third-party services can implement this. Because data sent from the server is less affected by browser restrictions or ad blockers, preserving accuracy.<\/p>\n\n\n\n<p><strong>Also read<\/strong>: <a href=\"https:\/\/easyinsights.ai\/blog\/why-meta-loves-first-party-data\/\">Why Meta Loves First Party Data<\/a><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Key Steps to Fix Cross-Domain Breakage<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Enable GA4 Cross-Domain<\/strong>: In your GA4 property, add all domains (main site, checkout, partners) under Admin > Data Streams > Configure tag settings > Domains.<br><\/li>\n\n\n\n<li><strong>Update Tags<\/strong>: Use gtag or GTM with linker or allowLinker=true so the _gl parameter is added to links between domains <a href=\"https:\/\/developers.google.com\/tag-platform\/devguides\/cross-domain#:~:text=1,changes%20and%20publish%20the%20container\">google.com<\/a>.<br><\/li>\n\n\n\n<li><strong>Consistent IDs<\/strong>: Make sure the same GA4 Measurement ID is used on every page of each domain, so GA4 recognizes the same property.<br><\/li>\n\n\n\n<li><strong>Test Thoroughly<\/strong>: Use GA4\u2019s DebugView or Tag Assistant to click through checkout links and ensure no new session is started (look for the _gl parameter and a single session_start).<br><\/li>\n\n\n\n<li><strong>Consider Server-Side<\/strong>: If cross-domain issues persist (e.g. if redirects strip URL params), use server-side tagging to capture events and link them to the original session on the backend.<br><\/li>\n\n\n\n<li><strong>Monitor Metrics<\/strong>: After fixing, watch for drops in \u201cUnassigned\u201d traffic and more coherent multi-step funnels. Proper setup should eliminate self-referrals and direct-attributed conversions at checkout<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Reconnect_Event_Flows_End-to-End_Across_Multi-Domain\"><\/span>How to Reconnect Event Flows End-to-End Across Multi-Domain<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When a user moves from&nbsp; yourstore.com \u2192 checkout.partner.com \u2192 success.yourstore.com, analytics can break the journey into 2-3 separate sessions. To reconnect this into <strong>one continuous flow<\/strong>, you must ensure:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The <strong>same user identifier persists<\/strong> across domains<br><\/li>\n\n\n\n<li>The <strong>session does not reset<\/strong><strong><br><\/strong><\/li>\n\n\n\n<li>The <strong>conversion event is tied to the original source and campaign<\/strong><strong><br><\/strong><\/li>\n\n\n\n<li>All tools (GA4, <a href=\"http:\/\/What is Facebook CAPI (Conversions API)\">Meta CAPI<\/a>, <a href=\"https:\/\/easyinsights.ai\/\">EasyInsights<\/a>, etc.) receive unified data<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_EasyInsights_Fixes_Multi-Domain_Tracking\"><\/span>How EasyInsights Fixes Multi-Domain Tracking<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-text-color has-background has-link-color wp-elements-20d04565be9d6c9602c596c9d8a6c08f\" style=\"color:#2c01ca;background-color:#e2dff4\"><strong>1. Unified Identity That Survives Any Domain Switch<\/strong><strong><br><\/strong>EasyInsights assigns a persistent user ID using browser signals, fingerprinting, and server-side fallbacks &#8211; so the journey stays intact even if cookies break, _gl is stripped, or users pass through 3-5 external domains.<\/p>\n\n\n\n<p class=\"has-text-color has-background has-link-color wp-elements-b6e49356aadaf967fafbe42dbb5ae582\" style=\"color:#2c01ca;background-color:#e2dff4\"><strong>2. Pixel + Server Tracking That Never Misses an Event<\/strong><strong><br><\/strong>The Pixel captures all frontend actions; the Server API captures backend confirmations &#8211; then EasyInsights merges them with a shared event ID.<br>\u2714 No duplicates<br>\u2714 No missing conversions<br>\u2714 No broken funnels<\/p>\n\n\n\n<p class=\"has-text-color has-background has-link-color wp-elements-e468e66e4281d6e81def556644d570ce\" style=\"color:#2c01ca;background-color:#e2dff4\"><strong>3. True, Clean Attribution Across Channels<br><\/strong> EasyInsights ties gclid, fbclid, UTMs, referrers, and fingerprinting together to show exactly which campaign drove which purchase &#8211; even if checkout happened off-domain.<\/p>\n\n\n\n<p class=\"has-text-color has-background has-link-color wp-elements-568d7e8b6868f8af7a8a1ff5841b588f\" style=\"color:#2c01ca;background-color:#e2dff4\"><strong>4. Complete Funnel Reconstruction<\/strong><strong><br><\/strong> Landing \u2192 Product \u2192 Cart \u2192 External Checkout \u2192 Payment \u2192 Purchase \u2192 CRM<br>All stitched into one timeline inside a single user profile.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Multi-domain checkouts aren\u2019t going away. In fact, as brands scale across new payment gateways, embedded wallets, and modular commerce stacks, the number of domains involved in a single purchase journey only grows. But the real danger isn\u2019t the complexity &#8211; it\u2019s the hidden data loss happening behind the scenes.<br><br>By implementing cross-domain tracking, maintaining consistent user identifiers, and strengthening your stack with server-side and first-party data strategies, you can restore a clean, uninterrupted view of how users move from ad to Final Conversion.<\/p>\n\n\n\n<p>Brands that fix cross-domain tracking can finally trust their measurement again, send accurate conversion signals to ad platforms, optimize faster, and scale with confidence.<br><br><strong>Fix your Broken Tracking with EasyInsights <\/strong>&#8211; <a href=\"https:\/\/easyinsights.ai\/book-demo\">Book a demo<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every time your user jumps from your main website to a third-party payment domain &#8211; Shopify, Razorpay, PayPal,&hellip;<\/p>\n","protected":false},"author":17,"featured_media":11368,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[134,59],"tags":[145,36,392,346],"class_list":["post-11364","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","category-tracking","tag-marketing","tag-marketing-optimization","tag-multi-domain-checkouts","tag-tracking"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Multi-Domain Checkouts Break Tracking and How to Fix it<\/title>\n<meta name=\"description\" content=\"Multi-domain checkouts break tracking, attribution, and conversion data. 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