fix utm unicode

src/app/[locale]/(payment)/payment/route.ts

@@ -3,6 +3,38 @@ import { NextRequest, NextResponse } from "next/server";
 import { createPaymentCheckout } from "@/entities/payment/api";
 import { ROUTES } from "@/shared/constants/client-routes";
 
+/**
+ * Convert base64 string to bytes (handles UTF-8 properly)
+ * MDN recommended approach: https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa#unicode_strings
+ */
+function base64ToBytes(base64: string): Uint8Array {
+  const binString = atob(base64);
+  return Uint8Array.from(binString, (m) => m.codePointAt(0) ?? 0);
+}
+
+/**
+ * Decode URL-safe base64 state parameter to UTM object
+ * Supports UTF-8 encoded content (e.g., utm_campaign=夏セール)
+ */
+function decodeStateParam(state: string): Record<string, string> | undefined {
+  if (!state) return undefined;
+
+  try {
+    // Restore URL-safe base64 to standard base64
+    let base64 = state.replace(/-/g, "+").replace(/_/g, "/");
+    // Add padding if needed
+    while (base64.length % 4) {
+      base64 += "=";
+    }
+    // Decode base64 to bytes, then decode UTF-8
+    const bytes = base64ToBytes(base64);
+    const json = new TextDecoder().decode(bytes);
+    return JSON.parse(json);
+  } catch {
+    return undefined;
+  }
+}
+
 export async function GET(req: NextRequest) {
   const productId = req.nextUrl.searchParams.get("productId");
   const placementId = req.nextUrl.searchParams.get("placementId");
@@ -10,11 +42,18 @@ export async function GET(req: NextRequest) {
   const fbPixels = req.nextUrl.searchParams.get("fb_pixels");
   const productPrice = req.nextUrl.searchParams.get("price");
   const currency = req.nextUrl.searchParams.get("currency");
+  const sessionId = req.nextUrl.searchParams.get("sessionId");
+  const state = req.nextUrl.searchParams.get("state");
+
+  // Decode state param to get UTM
+  const utm = state ? decodeStateParam(state) : undefined;
 
   const data = await createPaymentCheckout({
     productId: productId || "",
     placementId: placementId || "",
     paywallId: paywallId || "",
+    sessionId: sessionId || undefined,
+    utm,
   });
 
   let redirectUrl: URL = new URL(data?.paymentUrl || "", req.nextUrl.origin);

src/app/[locale]/auth/callback/route.ts

@@ -39,6 +39,8 @@ export async function GET(req: NextRequest) {
   const productPrice = searchParams.get("price");
   const currency = searchParams.get("currency");
   const nextUrl = searchParams.get("nextUrl");
+  const sessionId = searchParams.get("sessionId");
+  const state = searchParams.get("state");
 
   const redirectUrl = new URL(
     `${nextUrl || ROUTES.payment()}`,
@@ -51,6 +53,8 @@ export async function GET(req: NextRequest) {
   if (fbPixels) redirectUrl.searchParams.set("fb_pixels", fbPixels);
   if (productPrice) redirectUrl.searchParams.set("price", productPrice);
   if (currency) redirectUrl.searchParams.set("currency", currency);
+  if (sessionId) redirectUrl.searchParams.set("sessionId", sessionId);
+  if (state) redirectUrl.searchParams.set("state", state);
 
   const trackingCookies = extractTrackingCookiesFromUrl(req.nextUrl);
 

src/components/domains/email-marketing/compatibility/v1/LandingButtonWrapper/LandingButtonWrapper.tsx

@@ -7,6 +7,7 @@ import { Button, Typography } from "@/components/ui";
 import { BlurComponent } from "@/components/widgets";
 import { ROUTES } from "@/shared/constants/client-routes";
 import { translatePathEmailMarketingCompatibilityV1 } from "@/shared/constants/translate";
+import { getCurrentUtmParams } from "@/shared/utils/url";
 
 import styles from "./LandingButtonWrapper.module.scss";
 
@@ -17,7 +18,8 @@ export default function LandingButtonWrapper() {
   );
 
   const handleContinue = () => {
-    router.push(ROUTES.emailMarketingCompatibilityV1SpecialOffer());
+    const utmParams = getCurrentUtmParams();
+    router.push(ROUTES.emailMarketingCompatibilityV1SpecialOffer(utmParams));
   };
 
   return (

src/components/domains/email-marketing/compatibility/v1/SpecialOfferButtonWrapper/SpecialOfferButtonWrapper.tsx

@@ -7,6 +7,10 @@ import { Button, Typography } from "@/components/ui";
 import { BlurComponent } from "@/components/widgets";
 import { ROUTES } from "@/shared/constants/client-routes";
 import { translatePathEmailMarketingCompatibilityV1 } from "@/shared/constants/translate";
+import {
+  getSessionIdFromUrl,
+  getStateParamForRedirect,
+} from "@/shared/utils/url";
 
 import styles from "./SpecialOfferButtonWrapper.module.scss";
 
@@ -27,13 +31,20 @@ export default function SpecialOfferButtonWrapper({
   );
 
   const openPaymentModal = () => {
-    router.push(
+    const state = getStateParamForRedirect();
-      ROUTES.payment({
+    const sessionId = getSessionIdFromUrl();
-        productId,
+    const params: Record<string, string> = {
-        placementId,
+      productId,
-        paywallId,
+      placementId,
-      })
+      paywallId,
-    );
+    };
+    if (state) {
+      params.state = state;
+    }
+    if (sessionId) {
+      params.sessionId = sessionId;
+    }
+    router.push(ROUTES.payment(params));
   };
 
   return (

src/components/domains/email-marketing/soulmate/v1/LandingButtonWrapper/LandingButtonWrapper.tsx

@@ -7,6 +7,7 @@ import { Button, Typography } from "@/components/ui";
 import { BlurComponent } from "@/components/widgets";
 import { ROUTES } from "@/shared/constants/client-routes";
 import { translatePathEmailMarketingSoulmateV1 } from "@/shared/constants/translate";
+import { getCurrentUtmParams } from "@/shared/utils/url";
 
 import styles from "./LandingButtonWrapper.module.scss";
 
@@ -15,7 +16,8 @@ export default function LandingButtonWrapper() {
   const t = useTranslations(translatePathEmailMarketingSoulmateV1("Landing"));
 
   const handleContinue = () => {
-    router.push(ROUTES.emailMarketingSoulmateV1SpecialOffer());
+    const utmParams = getCurrentUtmParams();
+    router.push(ROUTES.emailMarketingSoulmateV1SpecialOffer(utmParams));
   };
 
   return (

src/components/domains/email-marketing/soulmate/v1/SpecialOfferButtonWrapper/SpecialOfferButtonWrapper.tsx

@@ -7,6 +7,10 @@ import { Button, Typography } from "@/components/ui";
 import { BlurComponent } from "@/components/widgets";
 import { ROUTES } from "@/shared/constants/client-routes";
 import { translatePathEmailMarketingSoulmateV1 } from "@/shared/constants/translate";
+import {
+  getSessionIdFromUrl,
+  getStateParamForRedirect,
+} from "@/shared/utils/url";
 
 import styles from "./SpecialOfferButtonWrapper.module.scss";
 
@@ -27,13 +31,20 @@ export default function SpecialOfferButtonWrapper({
   );
 
   const openPaymentModal = () => {
-    router.push(
+    const state = getStateParamForRedirect();
-      ROUTES.payment({
+    const sessionId = getSessionIdFromUrl();
-        productId,
+    const params: Record<string, string> = {
-        placementId,
+      productId,
-        paywallId,
+      placementId,
-      })
+      paywallId,
-    );
+    };
+    if (state) {
+      params.state = state;
+    }
+    if (sessionId) {
+      params.sessionId = sessionId;
+    }
+    router.push(ROUTES.payment(params));
   };
 
   return (

src/components/domains/secret-discount/save-off/Button/Button.tsx

@@ -6,6 +6,7 @@ import { useTranslations } from "next-intl";
 import { Button, Typography } from "@/components/ui";
 import { usePeriod } from "@/hooks/translations/usePeriod";
 import { ROUTES } from "@/shared/constants/client-routes";
+import { getCurrentUtmParams } from "@/shared/utils/url";
 import { PeriodType } from "@/types/period";
 
 import styles from "./Button.module.scss";
@@ -24,7 +25,8 @@ export default function SaveOffButton({
   const router = useRouter();
 
   const handleNext = () => {
-    router.push(ROUTES.secretDiscount());
+    const utmParams = getCurrentUtmParams();
+    router.push(ROUTES.secretDiscount(utmParams));
   };
 
   return (

src/components/domains/secret-discount/secret-discount/Button/Button.tsx

@@ -6,6 +6,10 @@ import { useTranslations } from "next-intl";
 import { Button, Typography } from "@/components/ui";
 import { usePeriod } from "@/hooks/translations/usePeriod";
 import { ROUTES } from "@/shared/constants/client-routes";
+import {
+  getSessionIdFromUrl,
+  getStateParamForRedirect,
+} from "@/shared/utils/url";
 import { PeriodType } from "@/types/period";
 
 import styles from "./Button.module.scss";
@@ -30,13 +34,20 @@ export default function SecretDiscountButton({
   const router = useRouter();
 
   const handleNext = () => {
-    router.push(
+    const state = getStateParamForRedirect();
-      ROUTES.payment({
+    const sessionId = getSessionIdFromUrl();
-        productId,
+    const params: Record<string, string> = {
-        placementId,
+      productId,
-        paywallId,
+      placementId,
-      })
+      paywallId,
-    );
+    };
+    if (state) {
+      params.state = state;
+    }
+    if (sessionId) {
+      params.sessionId = sessionId;
+    }
+    router.push(ROUTES.payment(params));
   };
 
   return (

src/entities/payment/types.ts

@@ -4,6 +4,8 @@ export const CheckoutRequestSchema = z.object({
   productId: z.string(),
   placementId: z.string(),
   paywallId: z.string(),
+  sessionId: z.string().optional(),
+  utm: z.record(z.string()).optional(),
 });
 export type CheckoutRequest = z.infer<typeof CheckoutRequestSchema>;
 

src/entities/user/types.ts

@@ -52,7 +52,7 @@ export const UserSchema = z.object({
   signDate: z.string().nullable().optional(),
   password: z.string(),
   externalId: z.string().optional(),
-  klaviyoId: z.string().nullable(),
+  klaviyoId: z.string().nullable().optional(),
   assistants: z.array(z.string()),
   createdAt: z.string().optional(),
   updatedAt: z.string(),

src/shared/constants/client-routes.ts

@@ -74,8 +74,10 @@ export const ROUTES = {
   paymentFailed: () => createRoute(["payment", "failed"]),
 
   // Secret Discount
-  saveOff: () => createRoute(["save-off"]),
+  saveOff: (queryParams?: Record<string, string>) =>
-  secretDiscount: () => createRoute(["secret-discount"]),
+    createRoute(["save-off"], queryParams),
+  secretDiscount: (queryParams?: Record<string, string>) =>
+    createRoute(["secret-discount"], queryParams),
 
   // Chat
   chat: (id?: string) => createRoute(["chat", id]),
@@ -86,16 +88,16 @@ export const ROUTES = {
   additionalPurchases: (type?: string) => createRoute(["ap", type]),
 
   // Email Marketing Compatibility V1
-  emailMarketingCompatibilityV1Landing: () =>
+  emailMarketingCompatibilityV1Landing: (queryParams?: Record<string, string>) =>
-    createRoute([emailMarketingCompatibilityV1Prefix, "landing"]),
+    createRoute([emailMarketingCompatibilityV1Prefix, "landing"], queryParams),
-  emailMarketingCompatibilityV1SpecialOffer: () =>
+  emailMarketingCompatibilityV1SpecialOffer: (queryParams?: Record<string, string>) =>
-    createRoute([emailMarketingCompatibilityV1Prefix, "special-offer"]),
+    createRoute([emailMarketingCompatibilityV1Prefix, "special-offer"], queryParams),
 
   // Email Marketing Soulmate V1
-  emailMarketingSoulmateV1Landing: () =>
+  emailMarketingSoulmateV1Landing: (queryParams?: Record<string, string>) =>
-    createRoute([emailMarketingSoulmateV1Prefix, "landing"]),
+    createRoute([emailMarketingSoulmateV1Prefix, "landing"], queryParams),
-  emailMarketingSoulmateV1SpecialOffer: () =>
+  emailMarketingSoulmateV1SpecialOffer: (queryParams?: Record<string, string>) =>
-    createRoute([emailMarketingSoulmateV1Prefix, "special-offer"]),
+    createRoute([emailMarketingSoulmateV1Prefix, "special-offer"], queryParams),
 
   // // Compatibility
   // compatibilities: () => createRoute(["compatibilities"]),

src/shared/utils/url.ts

@@ -0,0 +1,132 @@
+// Params that should NOT be included in state (they are passed separately)
+const EXCLUDED_STATE_PARAMS = [
+  "paywallId",
+  "placementId",
+  "productId",
+  "jwtToken",
+  "price",
+  "currency",
+  "fb_pixels",
+  "sessionId",
+  "state",
+  // Tracking cookies (passed separately)
+  "_fbc",
+  "_fbp",
+  "_ym_uid",
+  "_ym_d",
+  "_ym_isad",
+  "_ym_visorc",
+  "yandexuid",
+  "ymex",
+];
+
+/**
+ * Parse current query params from URL
+ */
+export const parseQueryParams = (): Record<string, string> => {
+  if (typeof window === "undefined") return {};
+
+  const params = new URLSearchParams(window.location.search);
+  const result: Record<string, string> = {};
+
+  for (const [key, value] of params.entries()) {
+    result[key] = value;
+  }
+
+  return result;
+};
+
+/**
+ * Get current query params that should be passed between screens and to payment
+ * Includes ALL params except internal ones (productId, placementId, etc.)
+ * Works with utm_*, fbclid, gclid, and any other marketing params
+ */
+export const getCurrentQueryParams = (): Record<string, string> => {
+  if (typeof window === "undefined") return {};
+
+  const params = parseQueryParams();
+  const utmParams: Record<string, string> = {};
+
+  for (const [key, value] of Object.entries(params)) {
+    const isExcluded =
+      EXCLUDED_STATE_PARAMS.includes(key) ||
+      key.startsWith("_ga") ||
+      key.startsWith("_gid");
+
+    if (!isExcluded && value) {
+      utmParams[key] = value;
+    }
+  }
+
+  return utmParams;
+};
+
+/**
+ * Convert bytes to base64 string (handles UTF-8 properly)
+ * MDN recommended approach: https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa#unicode_strings
+ */
+const bytesToBase64 = (bytes: Uint8Array): string => {
+  const binString = Array.from(bytes, (byte) =>
+    String.fromCodePoint(byte)
+  ).join("");
+  return btoa(binString);
+};
+
+/**
+ * Encode params as base64 JSON for state parameter
+ * Uses URL-safe base64 encoding with UTF-8 support
+ * Handles Unicode characters (e.g., utm_campaign=夏セール)
+ */
+export const encodeStateParam = (params: Record<string, string>): string => {
+  if (Object.keys(params).length === 0) return "";
+
+  try {
+    const json = JSON.stringify(params);
+    // Encode string as UTF-8 bytes, then convert to base64
+    const bytes = new TextEncoder().encode(json);
+    const base64 = bytesToBase64(bytes)
+      .replace(/\+/g, "-")
+      .replace(/\//g, "_")
+      .replace(/=+$/, "");
+    return base64;
+  } catch {
+    return "";
+  }
+};
+
+/**
+ * Get base64-encoded state parameter with current query params
+ */
+export const getStateParamForRedirect = (): string => {
+  const params = getCurrentQueryParams();
+  return encodeStateParam(params);
+};
+
+/**
+ * Get sessionId from current URL if present
+ */
+export const getSessionIdFromUrl = (): string | undefined => {
+  if (typeof window === "undefined") return undefined;
+  const params = new URLSearchParams(window.location.search);
+  return params.get("sessionId") || undefined;
+};
+
+/**
+ * Build URL with current query params preserved
+ */
+export const buildUrlWithQueryParams = (baseUrl: string): string => {
+  const params = getCurrentQueryParams();
+
+  if (Object.keys(params).length === 0) return baseUrl;
+
+  const url = new URL(baseUrl, window.location.origin);
+  for (const [key, value] of Object.entries(params)) {
+    url.searchParams.set(key, value);
+  }
+
+  return url.pathname + url.search;
+};
+
+// Backward compatibility aliases
+export const getCurrentUtmParams = getCurrentQueryParams;
+export const buildUrlWithUtmParams = buildUrlWithQueryParams;