diff --git a/changelog/fix-trim-woopay-source-url b/changelog/fix-trim-woopay-source-url
new file mode 100644
index 00000000000..d0542cc8201
--- /dev/null
+++ b/changelog/fix-trim-woopay-source-url
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Checkout error when page URL is too long
diff --git a/client/checkout/woopay/email-input-iframe.js b/client/checkout/woopay/email-input-iframe.js
index f57c3b4e90f..4a2efe861e5 100644
--- a/client/checkout/woopay/email-input-iframe.js
+++ b/client/checkout/woopay/email-input-iframe.js
@@ -263,7 +263,10 @@ export const handleWooPayEmailInput = async (
 		);
 		urlParams.append( 'wcpayVersion', getConfig( 'wcpayVersionNumber' ) );
 		urlParams.append( 'is_blocks', isBlocksCheckout ? 'true' : 'false' );
-		urlParams.append( 'source_url', window.location.href );
+		urlParams.append(
+			'source_url',
+			wcSettings?.storePages?.checkout?.permalink
+		);
 		urlParams.append(
 			'viewport',
 			`${ viewportWidth }x${ viewportHeight }`
diff --git a/client/components/woopay/save-user/checkout-page-save-user.js b/client/components/woopay/save-user/checkout-page-save-user.js
index 8edd7c583d4..c38bcae2929 100644
--- a/client/components/woopay/save-user/checkout-page-save-user.js
+++ b/client/components/woopay/save-user/checkout-page-save-user.js
@@ -73,7 +73,8 @@ const CheckoutPageSaveUser = ( { isBlocksCheckout } ) => {
 				? {}
 				: {
 						save_user_in_woopay: isSaveDetailsChecked,
-						woopay_source_url: window.location.href,
+						woopay_source_url:
+							wcSettings?.storePages?.checkout?.permalink,
 						woopay_is_blocks: true,
 						woopay_viewport: `${ viewportWidth }x${ viewportHeight }`,
 						woopay_user_phone_field: {
@@ -291,7 +292,9 @@ const CheckoutPageSaveUser = ( { isBlocksCheckout } ) => {
 						<input
 							type="hidden"
 							name="woopay_source_url"
-							value={ window.location.href }
+							value={
+								wcSettings?.storePages?.checkout?.permalink
+							}
 						/>
 						<input
 							type="hidden"
diff --git a/tests/js/jest-test-file-setup.js b/tests/js/jest-test-file-setup.js
index 5956c6c748e..c4d9395a9a1 100644
--- a/tests/js/jest-test-file-setup.js
+++ b/tests/js/jest-test-file-setup.js
@@ -89,6 +89,11 @@ global.wcSettings = {
 		CA: 'Canada',
 		UK: 'United Kingdom',
 	},
+	storePages: {
+		checkout: {
+			permalink: 'http://localhost/',
+		},
+	},
 };
 
 global.wpApiSettings = {