diff --git a/src/pretix/static/pretixpresale/js/widget/widget.js b/src/pretix/static/pretixpresale/js/widget/widget.js
index 34179e8772..3529acdd8f 100644
--- a/src/pretix/static/pretixpresale/js/widget/widget.js
+++ b/src/pretix/static/pretixpresale/js/widget/widget.js
@@ -2051,9 +2051,16 @@ var shared_root_methods = {
             this.$root.set_cart_id(data.cart_id);
             this.$root.overlay.frame_loading = false;
             callback()
-        }, () => {
+        }, (xhr, data) => {
+          if (xhr.status === 429 && typeof xhr.responseURL !== "undefined") {
+            this.$root.overlay.error_message = strings['cart_error_429'];
+            this.$root.overlay.frame_loading = false;
+            this.$root.overlay.error_url_after = this.$root.newTabTarget;
+            this.$root.overlay.error_url_after_new_tab = true;
+          } else {
             this.$root.overlay.error_message = strings['cart_error'];
             this.$root.overlay.frame_loading = false;
+          }
         })
     },
     get_cart_id: function() {
@@ -2142,7 +2149,14 @@ var shared_root_computed = {
         if (this.subevent) {
             target = this.target_url + this.subevent + '/';
         }
-        return target;
+        var parameters = this.$root.consent_parameter
+        if (this.$root.additionalURLParams) {
+          parameters += `&${this.$root.additionalURLParams}`
+        }
+        if (parameters) {
+          target += '?' + parameters.replace(/^&/, '')
+        }
+        return target
     },
     useIframe: function () {
         if (window.crossOriginIsolated === true) {
diff --git a/src/pretix/static/pretixpresale/widget/src/sharedStore.ts b/src/pretix/static/pretixpresale/widget/src/sharedStore.ts
index 1c44a9eb40..f43398316b 100644
--- a/src/pretix/static/pretixpresale/widget/src/sharedStore.ts
+++ b/src/pretix/static/pretixpresale/widget/src/sharedStore.ts
@@ -162,7 +162,15 @@ export function createWidgetStore (config: {
 				return params.toString()
 			},
 			newTabTarget (): string {
-				return this.subevent ? `${this.targetUrl}${this.subevent}/` : this.targetUrl
+				let url = this.subevent ? `${this.targetUrl}${this.subevent}/` : this.targetUrl
+				let parameters = this.consentParameter
+				if (this.additionalURLParams) {
+					parameters += `&${this.additionalURLParams}`
+				}
+				if (parameters) {
+					url += '?' + parameters.replace(/^&/, '')
+				}
+				return url
 			},
 			formTarget (): string {
 				const isFirefox = navigator.userAgent.toLowerCase().includes('firefox')
@@ -441,6 +449,7 @@ export function createWidgetStore (config: {
 							this.overlay.frameLoading = false
 							this.overlay.errorUrlAfter = this.newTabTarget
 							this.overlay.errorUrlAfterNewTab = true
+							return
 						} else if (e.status === 405) {
 							// Likely a redirect!
 							this.targetUrl = e.responseUrl.substring(0, e.responseUrl.indexOf('/cart/add') - 18)
@@ -460,11 +469,18 @@ export function createWidgetStore (config: {
 					this.overlay.frameLoading = true
 					const data = await createCart(url)
 					this.setCartId(data.cart_id)
+					return true
 				} catch (e) {
-					if (e instanceof ApiError && (e.status === 200 || (e.status >= 400 && e.status < 500))) {
+					if (e instanceof ApiError && e.status === 429) {
+						this.overlay.errorMessage = STRINGS.cart_error_429
+						this.overlay.frameLoading = false
+						this.overlay.errorUrlAfter = this.newTabTarget
+						this.overlay.errorUrlAfterNewTab = true
+					} else if (e instanceof ApiError && (e.status === 200 || (e.status >= 400 && e.status < 500))) {
 						this.overlay.errorMessage = STRINGS.cart_error
 						this.overlay.frameLoading = false
 					}
+					return false
 				}
 			},
 			redeem (voucherCode: string, event?: Event) {
@@ -484,7 +500,7 @@ export function createWidgetStore (config: {
 			async resume () {
 				if (!this.cartId && this.keepCart) {
 					// create an empty cart whose id we can persist
-					await this.createCart()
+					if (!await this.createCart()) return
 				}
 				let redirectUrl = `${this.targetUrl}w/${globalWidgetId}/`
 				if (this.subevent && this.isButton && this.items.length === 0) {