diff --git a/apps/backend/src/services/session/session-redeem.js b/apps/backend/src/services/session/session-redeem.ts
similarity index 72%
rename from apps/backend/src/services/session/session-redeem.js
rename to apps/backend/src/services/session/session-redeem.ts
index cbc764ba..af6be4bc 100644
--- a/apps/backend/src/services/session/session-redeem.js
+++ b/apps/backend/src/services/session/session-redeem.ts
@@ -1,7 +1,137 @@
-// @ts-nocheck
+/// <reference lib="dom" />
 
 import fs from 'node:fs/promises'
 
+type JsonObject = Record<string, any>
+
+type BrowserResponseLike = {
+  url: () => string
+  request: () => { method: () => string }
+  text: () => Promise<string>
+  status: () => number
+}
+
+type BrowserLocatorLike = {
+  screenshot: (options: { path: string }) => Promise<void>
+  getAttribute: (name: string) => Promise<string | null>
+  click: (options?: JsonObject) => Promise<void>
+  evaluate: <T = unknown>(callback: (element: Element) => T | Promise<T>) => Promise<T>
+}
+
+type BrowserPageLike = {
+  waitForFunction: (callback: any, argOrOptions?: any, options?: JsonObject) => Promise<unknown>
+  waitForResponse: (
+    predicate: (response: BrowserResponseLike) => boolean,
+    options?: JsonObject,
+  ) => Promise<BrowserResponseLike>
+  waitForTimeout: (milliseconds: number) => Promise<void>
+  locator: (selector: string) => BrowserLocatorLike
+  evaluate: <T = any>(callback: any, arg?: any) => Promise<T>
+}
+
+type ActivityInfo = {
+  role?: JsonObject & {
+    ready?: boolean
+    area?: string
+  }
+  form?: {
+    cdkeyInputId?: string
+    verifyInputId?: string
+    verifyImgId?: string
+    submitId?: string
+  }
+}
+
+type TencentRedeemPopup = {
+  visible?: boolean
+  text?: string
+  detail?: string
+}
+
+type TencentRedeemResult = JsonObject & {
+  iRet?: number | string
+  sMsg?: string
+  msg?: string
+  popup?: TencentRedeemPopup | null
+}
+
+type TencentRedeemOutcome = 'success' | 'captcha_rejected' | 'code_used' | 'code_invalid' | 'failed'
+
+type TencentRedeemClassification = {
+  outcome: TencentRedeemOutcome
+  success: boolean
+  retryWithSameCode: boolean
+  retryWithReplacementCode: boolean
+  retCode: number | null
+  message: string
+}
+
+type RedeemAttemptRecord = {
+  attempt: number
+  verifyCode: string
+  verifysession: string
+  ocrSample: unknown
+  redeem: TencentRedeemResult
+  classification: TencentRedeemClassification
+  role: ActivityInfo['role']
+}
+
+type TencentBrowserRedeemSession = JsonObject & {
+  status: string
+  notice: string
+  updatedAt: string
+  lastError?: string
+  lastRedeem?: JsonObject
+  page: BrowserPageLike
+  browserContext: unknown
+  sessionDir: string
+  sessionId: string
+}
+
+type RunTencentBrowserRedeemOptions = {
+  session: TencentBrowserRedeemSession
+  code: string
+  maxAttempts: number
+  ensureLoggedInPresentation: (session: TencentBrowserRedeemSession, options?: JsonObject) => Promise<unknown>
+  ensureActivityInfoReady: (page: BrowserPageLike, options?: JsonObject) => Promise<ActivityInfo>
+  fillRedeemCodeInBrowser: (page: BrowserPageLike, code: string, options?: JsonObject) => Promise<unknown>
+  capturePageCaptchaForOcr: (
+    page: BrowserPageLike,
+    options: { sessionDir: string; attempt: number },
+  ) => Promise<{
+    imageBuffer: Buffer
+    imagePath: string
+    imageExtension: string
+    contentType: string
+    verifyImgId: string
+    verifysession: string
+  }>
+  recognizeTencentCaptcha: (payload: JsonObject) => Promise<JsonObject>
+  submitRedeemInBrowser: (
+    page: BrowserPageLike,
+    payload: { code: string; verifyCode: string },
+  ) => Promise<TencentRedeemResult>
+  isCaptchaRejectedResult: (result: TencentRedeemResult) => boolean
+  refreshPageCaptcha: (page: BrowserPageLike, verifyImgId?: string) => Promise<void>
+  persistSessionState: (session: TencentBrowserRedeemSession) => Promise<unknown>
+  buildSessionPayload: (session: TencentBrowserRedeemSession) => JsonObject
+  saveRedeemArtifacts: (payload: JsonObject) => Promise<JsonObject>
+  activityUrl: string
+}
+
+type ActivityInfoProvider = {
+  ensureActivityInfoReady: (page: BrowserPageLike, options?: JsonObject) => Promise<ActivityInfo>
+}
+
+declare global {
+  interface Window {
+    Milo?: {
+      get?: (key: string) => unknown
+    }
+    closeDialog?: () => void
+  }
+}
+
 export async function runTencentBrowserRedeem({
   session,
   code,
@@ -18,14 +148,14 @@ export async function runTencentBrowserRedeem({
   buildSessionPayload,
   saveRedeemArtifacts,
   activityUrl,
-}) {
+}: RunTencentBrowserRedeemOptions): Promise<JsonObject> {
   session.status = 'redeeming'
   session.notice = '正在识别验证码并提交兑换'
   session.updatedAt = new Date().toISOString()
   await persistSessionState(session)
 
-  const attempts = []
-  let finalResult = null
+  const attempts: RedeemAttemptRecord[] = []
+  let finalResult: RedeemAttemptRecord | null = null
 
   try {
     await ensureLoggedInPresentation(session, { credentialReady: true })
@@ -133,7 +263,10 @@ export async function runTencentBrowserRedeem({
   }
 }
 
-export async function capturePageCaptchaForOcr(page, { sessionDir, attempt, ensureActivityInfoReady }) {
+export async function capturePageCaptchaForOcr(
+  page: BrowserPageLike,
+  { sessionDir, attempt, ensureActivityInfoReady }: { sessionDir: string; attempt: number } & ActivityInfoProvider,
+) {
   const activityInfo = await ensureActivityInfoReady(page, { timeoutMs: 5_000 })
 
   if (!activityInfo?.form?.verifyImgId) {
@@ -187,7 +320,11 @@ export async function capturePageCaptchaForOcr(page, { sessionDir, attempt, ensu
   }
 }
 
-export async function submitRedeemInBrowser(page, payload, { ensureActivityInfoReady }) {
+export async function submitRedeemInBrowser(
+  page: BrowserPageLike,
+  payload: { code: string; verifyCode: string },
+  { ensureActivityInfoReady }: ActivityInfoProvider,
+): Promise<TencentRedeemResult> {
   const activityInfo = await ensureActivityInfoReady(page, { timeoutMs: 2_000 })
 
   if (!activityInfo?.form?.verifyInputId || !activityInfo?.form?.submitId) {
@@ -237,7 +374,11 @@ export async function submitRedeemInBrowser(page, payload, { ensureActivityInfoR
   }
 }
 
-export function fillRedeemCodeInBrowser(page, code, { activityInfo }) {
+export function fillRedeemCodeInBrowser(
+  page: BrowserPageLike,
+  code: string,
+  { activityInfo }: { activityInfo?: ActivityInfo } = {},
+) {
   const cdkeySelector = activityInfo?.form?.cdkeyInputId
     ? `#${activityInfo.form.cdkeyInputId}`
     : '[id^="milo_cdkeyInfo_"]'
@@ -252,12 +393,16 @@ export function fillRedeemCodeInBrowser(page, code, { activityInfo }) {
   ])
 }
 
-export async function prepareRedeemCodeFill(page, code, { ensureActivityInfoReady }) {
+export async function prepareRedeemCodeFill(
+  page: BrowserPageLike,
+  code: string,
+  { ensureActivityInfoReady }: ActivityInfoProvider,
+) {
   const activityInfo = await ensureActivityInfoReady(page, { triggerRender: true, timeoutMs: 2_000 })
   await fillRedeemCodeInBrowser(page, code, { activityInfo })
 }
 
-export async function refreshPageCaptcha(page, verifyImgId) {
+export async function refreshPageCaptcha(page: BrowserPageLike, verifyImgId?: string) {
   if (!verifyImgId) {
     return
   }
@@ -280,7 +425,7 @@ export async function refreshPageCaptcha(page, verifyImgId) {
   ).catch(() => null)
 }
 
-export function isCaptchaRejectedResult(result) {
+export function isCaptchaRejectedResult(result: TencentRedeemResult): boolean {
   if (classifyTencentRedeemResult(result).outcome === 'captcha_rejected') {
     return true
   }
@@ -288,7 +433,7 @@ export function isCaptchaRejectedResult(result) {
   return false
 }
 
-export function classifyTencentRedeemResult(result) {
+export function classifyTencentRedeemResult(result: TencentRedeemResult): TencentRedeemClassification {
   const retCode = Number(result?.iRet)
   const message = resolveTencentRedeemMessage(result)
   const normalized = normalizeTencentRedeemText(message)
@@ -323,7 +468,7 @@ export function classifyTencentRedeemResult(result) {
   return buildTencentRedeemClassification('failed', retCode, message || '兑换失败')
 }
 
-function resetRedeemPopup(page) {
+function resetRedeemPopup(page: BrowserPageLike) {
   return page.evaluate(() => {
     const popup = document.querySelector('#pop2')
     const popupText = document.querySelector('#PopText')
@@ -344,7 +489,7 @@ function resetRedeemPopup(page) {
   })
 }
 
-async function dismissRedeemRetryPopup(page) {
+async function dismissRedeemRetryPopup(page: BrowserPageLike) {
   await page.evaluate(() => {
     try {
       if (typeof window.closeDialog === 'function') {
@@ -372,7 +517,7 @@ async function dismissRedeemRetryPopup(page) {
   await page.waitForTimeout(150)
 }
 
-async function normalizeRedeemOverlay(page) {
+async function normalizeRedeemOverlay(page: BrowserPageLike) {
   await page.evaluate(() => {
     const overlayIds = ['_overlay_', 'overlay_mask', 'overlay']
 
@@ -390,7 +535,7 @@ async function normalizeRedeemOverlay(page) {
   })
 }
 
-async function clickRedeemSubmit(page, submitSelector) {
+async function clickRedeemSubmit(page: BrowserPageLike, submitSelector: string) {
   const locator = page.locator(submitSelector)
 
   try {
@@ -412,12 +557,12 @@ async function clickRedeemSubmit(page, submitSelector) {
   }
 }
 
-async function setFormControlValue(page, selector, value) {
+async function setFormControlValue(page: BrowserPageLike, selector: string, value: unknown) {
   const nextValue = String(value ?? '')
 
   const appliedValue = await page.evaluate(
     ({ targetSelector, targetValue }) => {
-      const isVisible = (element) => {
+      const isVisible = (element: Element) => {
         if (!(element instanceof HTMLElement)) {
           return false
         }
@@ -491,7 +636,7 @@ async function setFormControlValue(page, selector, value) {
   }
 }
 
-async function waitForRedeemPopup(page) {
+async function waitForRedeemPopup(page: BrowserPageLike): Promise<TencentRedeemPopup> {
   await page.waitForFunction(() => {
     const popup = document.querySelector('#pop2')
     const popupText = document.querySelector('#PopText')
@@ -511,7 +656,7 @@ async function waitForRedeemPopup(page) {
   }))
 }
 
-function tryParseJson(text) {
+function tryParseJson(text: string): any {
   try {
     return JSON.parse(text)
   } catch {
@@ -519,7 +664,7 @@ function tryParseJson(text) {
   }
 }
 
-function inferRedeemCodeFromPopup(popup) {
+function inferRedeemCodeFromPopup(popup: TencentRedeemPopup) {
   const text = `${String(popup?.text || '')} ${String(popup?.detail || '')}`.trim()
 
   if (!text) {
@@ -537,7 +682,7 @@ function inferRedeemCodeFromPopup(popup) {
   return 1
 }
 
-export function resolveTencentRedeemMessage(result) {
+export function resolveTencentRedeemMessage(result: TencentRedeemResult): string {
   const candidates = [
     result?.popup?.detail,
     result?.popup?.text,
@@ -550,7 +695,11 @@ export function resolveTencentRedeemMessage(result) {
   return candidates[0] || '兑换完成'
 }
 
-function buildTencentRedeemClassification(outcome, retCode, message) {
+function buildTencentRedeemClassification(
+  outcome: TencentRedeemOutcome,
+  retCode: number,
+  message: string,
+): TencentRedeemClassification {
   return {
     outcome,
     success: outcome === 'success',
@@ -561,7 +710,7 @@ function buildTencentRedeemClassification(outcome, retCode, message) {
   }
 }
 
-function normalizeTencentRedeemText(value) {
+function normalizeTencentRedeemText(value: unknown): string {
   return String(value || '')
     .replace(/\s+/g, '')
     .trim()
diff --git a/apps/backend/tsconfig.json b/apps/backend/tsconfig.json
index 4111c803..e31204e4 100644
--- a/apps/backend/tsconfig.json
+++ b/apps/backend/tsconfig.json
@@ -19,7 +19,7 @@
     "node_modules",
     "data",
     "src/**/*.test.js",
-    "src/services/session/**",
+    "src/services/session/**/*.js",
     "src/services/platforms/agiso/**/*.js"
   ]
 }
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index 9fc3d4fc..88d109b2 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -389,6 +389,14 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+71. 腾讯浏览器会话兑换服务迁移到 `.ts`：
+    - `src/services/session/session-redeem.ts`
+72. 会话兑换编排、验证码截图 / OCR payload、页面提交、弹窗结果解析、兑换结果分类已补轻量结构类型；`tsconfig.json` 已将 session 新增 `.ts` 文件纳入 `typecheck`，旧 session `.js` 文件继续暂时排除
+73. Docker 内验证通过：
+    - `src/services/session/session-redeem.test.js` 共 6 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
 
 ## 下一步建议