diff --git a/client/lib/core/config/license_plans.dart b/client/lib/core/config/license_plans.dart
new file mode 100644
index 0000000..9c23fd5
--- /dev/null
+++ b/client/lib/core/config/license_plans.dart
@@ -0,0 +1,46 @@
+/// 在线购买套餐目录（App 内购买/续费弹窗用）。
+///
+/// 价格仅前端展示，实付金额以 pay 侧套餐表为准（下单响应回传 amount）；
+/// biz_code 与后端 payPlans、官网 checkout 页三方一致，改动需同步。
+class LicensePlan {
+  final String bizCode;
+  final int price; // 元（仅展示）
+  final int days;
+  const LicensePlan(this.bizCode, this.price, this.days);
+}
+
+class LicensePlanGroup {
+  final String name;
+  final List<String> feats;
+  final LicensePlan monthly;
+  final LicensePlan annual;
+  const LicensePlanGroup({
+    required this.name,
+    required this.feats,
+    required this.monthly,
+    required this.annual,
+  });
+}
+
+class LicensePlans {
+  static const standard = LicensePlanGroup(
+    name: '标准版',
+    feats: ['单门店 · 单仓库', '2 台客户端同时使用', '1,000 张商品图片分享'],
+    monthly: LicensePlan('monthly_standard', 299, 30),
+    annual: LicensePlan('annual_standard', 2999, 365),
+  );
+
+  static const pro = LicensePlanGroup(
+    name: '高级版',
+    feats: [
+      '单门店 · 多仓库',
+      '5 台客户端同时使用',
+      '10,000 张商品图片分享',
+      '免费 AI 周度 / 月度商业数据分析',
+    ],
+    monthly: LicensePlan('monthly_pro', 599, 30),
+    annual: LicensePlan('annual_pro', 5999, 365),
+  );
+
+  static const groups = [standard, pro];
+}
diff --git a/client/lib/models/license.dart b/client/lib/models/license.dart
index 0bf6eaf..bbe4933 100644
--- a/client/lib/models/license.dart
+++ b/client/lib/models/license.dart
@@ -64,3 +64,57 @@ class LicenseInfo {
   bool get needsAttention =>
       phase == 'grace' || phase == 'readonly' || phase == 'locked';
 }
+
+/// POST /license/purchase 响应：pay 收银台跳转信息。
+class PurchaseOrder {
+  final String payUrl;
+  final String outTradeNo;
+  final String amount; // 实付金额（pay 侧权威价，如 "2999.00"）
+  final String subject;
+
+  const PurchaseOrder({
+    required this.payUrl,
+    required this.outTradeNo,
+    required this.amount,
+    required this.subject,
+  });
+
+  factory PurchaseOrder.fromJson(Map<String, dynamic> json) => PurchaseOrder(
+        payUrl: json['pay_url'] as String? ?? '',
+        outTradeNo: json['out_trade_no'] as String? ?? '',
+        amount: json['amount'] as String? ?? '',
+        subject: json['subject'] as String? ?? '',
+      );
+}
+
+/// GET /license/purchase/:otn 响应：购买单状态（到账轮询用）。
+class PurchaseStatusInfo {
+  final String outTradeNo;
+  final String status; // pending | paid | failed
+  final String amount;
+  final DateTime? paidAt;
+  final DateTime? expiresAt; // 续期后的门店授权到期时间（仅 paid 时有值）
+
+  const PurchaseStatusInfo({
+    required this.outTradeNo,
+    required this.status,
+    required this.amount,
+    this.paidAt,
+    this.expiresAt,
+  });
+
+  bool get isPaid => status == 'paid';
+
+  factory PurchaseStatusInfo.fromJson(Map<String, dynamic> json) =>
+      PurchaseStatusInfo(
+        outTradeNo: json['out_trade_no'] as String? ?? '',
+        status: json['status'] as String? ?? 'pending',
+        amount: json['amount'] as String? ?? '',
+        paidAt: json['paid_at'] != null
+            ? DateTime.tryParse(json['paid_at'] as String)
+            : null,
+        expiresAt: json['expires_at'] != null
+            ? DateTime.tryParse(json['expires_at'] as String)
+            : null,
+      );
+}
diff --git a/client/lib/repositories/license_repository.dart b/client/lib/repositories/license_repository.dart
index 4ccada8..f21a2e5 100644
--- a/client/lib/repositories/license_repository.dart
+++ b/client/lib/repositories/license_repository.dart
@@ -40,6 +40,34 @@ class LicenseRepository {
     }
   }
 
+  /// 在线购买/续费下单（仅管理员），返回 pay 收银台跳转信息。
+  Future<PurchaseOrder> createPurchase(String bizCode) async {
+    try {
+      final resp =
+          await _client.post('/license/purchase', data: {'biz_code': bizCode});
+      return PurchaseOrder.fromJson(resp.data['data'] as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '下单失败，请稍后重试',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// 查询购买单状态（到账轮询）。到账（paid）后返回续期后的授权到期时间。
+  Future<PurchaseStatusInfo> purchaseStatus(String outTradeNo) async {
+    try {
+      final resp = await _client.get('/license/purchase/$outTradeNo');
+      return PurchaseStatusInfo.fromJson(
+          resp.data['data'] as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '查询订单状态失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
   /// Deactivate (unbind) this device from its license.
   Future<void> deactivate() async {
     final deviceId = await DeviceId.get();
diff --git a/client/lib/screens/settings/purchase_dialog.dart b/client/lib/screens/settings/purchase_dialog.dart
new file mode 100644
index 0000000..db11fea
--- /dev/null
+++ b/client/lib/screens/settings/purchase_dialog.dart
@@ -0,0 +1,310 @@
+// screens/settings/purchase_dialog.dart — App 内在线购买/续费授权。
+// 流程：套餐选择（标准/高级 × 月付/年付）→ POST /license/purchase 下单 →
+// 外部浏览器打开 pay 收银台（移动端由系统拉起支付宝 App）→ 本弹窗轮询
+// GET /license/purchase/:otn，webhook 续期到账后自动刷新授权并展示新到期日。
+// 价格仅展示，实付以 pay 侧套餐表为准（下单响应回传 amount）。
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:intl/intl.dart';
+import 'package:lucide_icons_flutter/lucide_icons.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+import '../../core/config/license_plans.dart';
+import '../../core/responsive/responsive.dart';
+import '../../core/theme/app_dims.g.dart';
+import '../../core/theme/app_fonts.dart';
+import '../../core/theme/app_tokens.dart';
+import '../../core/theme/context_tokens.dart';
+import '../../core/utils/dialog_util.dart';
+import '../../models/license.dart';
+import '../../providers/license_provider.dart';
+import '../../widgets/ds/ds_atoms.dart';
+import '../../widgets/ds/ds_toast.dart';
+
+Future<void> showPurchaseDialog(BuildContext context) {
+  return showAppDialog(
+    context: context,
+    barrierDismissible: false,
+    builder: (_) => const _PurchaseDialog(),
+  );
+}
+
+enum _Phase { pick, waiting, success }
+
+class _PurchaseDialog extends ConsumerStatefulWidget {
+  const _PurchaseDialog();
+
+  @override
+  ConsumerState<_PurchaseDialog> createState() => _PurchaseDialogState();
+}
+
+class _PurchaseDialogState extends ConsumerState<_PurchaseDialog> {
+  _Phase _phase = _Phase.pick;
+  int _groupIdx = 0; // 0=标准版 1=高级版
+  int _cycleIdx = 0; // 0=年付 1=月付
+  bool _submitting = false;
+  bool _checking = false;
+
+  PurchaseOrder? _order;
+  DateTime? _newExpiresAt;
+  Timer? _pollTimer;
+
+  LicensePlanGroup get _group => LicensePlans.groups[_groupIdx];
+  LicensePlan get _plan => _cycleIdx == 0 ? _group.annual : _group.monthly;
+  String get _cycleLabel => _cycleIdx == 0 ? '年付' : '月付';
+
+  @override
+  void dispose() {
+    _pollTimer?.cancel();
+    super.dispose();
+  }
+
+  Future<void> _submit() async {
+    setState(() => _submitting = true);
+    try {
+      final order =
+          await ref.read(licenseRepositoryProvider).createPurchase(_plan.bizCode);
+      // 外部浏览器打开收银台：桌面端进网页支付，移动端由系统浏览器拉起支付宝
+      await launchUrl(Uri.parse(order.payUrl),
+          mode: LaunchMode.externalApplication);
+      if (!mounted) return;
+      setState(() {
+        _order = order;
+        _phase = _Phase.waiting;
+        _submitting = false;
+      });
+      _pollTimer =
+          Timer.periodic(const Duration(seconds: 3), (_) => _poll());
+    } catch (e) {
+      if (!mounted) return;
+      setState(() => _submitting = false);
+      showDsToast(context, '下单失败：$e', bg: context.tokens.danger);
+    }
+  }
+
+  Future<void> _poll({bool manual = false}) async {
+    final order = _order;
+    if (order == null || _checking) return;
+    _checking = true;
+    try {
+      final st =
+          await ref.read(licenseRepositoryProvider).purchaseStatus(order.outTradeNo);
+      if (!mounted) return;
+      if (st.isPaid) {
+        _pollTimer?.cancel();
+        ref.invalidate(licenseProvider);
+        setState(() {
+          _newExpiresAt = st.expiresAt;
+          _phase = _Phase.success;
+        });
+      } else if (manual) {
+        showDsToast(context, '尚未确认到账，支付完成后通常数秒内到账');
+      }
+    } catch (e) {
+      if (mounted && manual) {
+        showDsToast(context, '查询失败：$e', bg: context.tokens.danger);
+      }
+    } finally {
+      _checking = false;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final t = context.tokens;
+    return AlertDialog(
+      title: Text(switch (_phase) {
+        _Phase.pick => '在线购买 / 续费',
+        _Phase.waiting => '等待支付',
+        _Phase.success => '支付成功',
+      }),
+      content: SizedBox(
+        width: context.dialogWidth(460),
+        child: switch (_phase) {
+          _Phase.pick => _buildPick(t),
+          _Phase.waiting => _buildWaiting(t),
+          _Phase.success => _buildSuccess(t),
+        },
+      ),
+      actions: switch (_phase) {
+        _Phase.pick => [
+            DsButton('取消',
+                onPressed:
+                    _submitting ? null : () => Navigator.of(context).pop()),
+            DsButton(_submitting ? '正在创建订单…' : '提交订单 · ¥${_fmt(_plan.price)}',
+                variant: DsBtnVariant.primary,
+                onPressed: _submitting ? null : _submit),
+          ],
+        _Phase.waiting => [
+            DsButton('稍后再说', onPressed: () => Navigator.of(context).pop()),
+            DsButton('我已完成支付',
+                variant: DsBtnVariant.primary,
+                onPressed: () => _poll(manual: true)),
+          ],
+        _Phase.success => [
+            DsButton('完成',
+                variant: DsBtnVariant.primary,
+                onPressed: () => Navigator.of(context).pop()),
+          ],
+      },
+    );
+  }
+
+  Widget _buildPick(AppTokens t) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Row(children: [
+          DsSeg(
+            items: [for (final g in LicensePlans.groups) g.name],
+            index: _groupIdx,
+            onChanged: (i) => setState(() => _groupIdx = i),
+          ),
+          const SizedBox(width: 10),
+          DsSeg(
+            items: const ['年付', '月付'],
+            index: _cycleIdx,
+            onChanged: (i) => setState(() => _cycleIdx = i),
+          ),
+        ]),
+        const SizedBox(height: 14),
+        Container(
+          width: double.infinity,
+          padding: const EdgeInsets.all(14),
+          decoration: BoxDecoration(
+            color: t.bg,
+            border: Border.all(color: t.border),
+            borderRadius: BorderRadius.circular(AppDims.rMd),
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              for (final f in _group.feats)
+                Padding(
+                  padding: const EdgeInsets.symmetric(vertical: 3),
+                  child: Row(children: [
+                    Icon(LucideIcons.check, size: 14, color: t.success),
+                    const SizedBox(width: 8),
+                    Expanded(
+                        child: Text(f,
+                            style: TextStyle(
+                                fontSize: AppDims.fsSm, color: t.text))),
+                  ]),
+                ),
+            ],
+          ),
+        ),
+        const SizedBox(height: 14),
+        Row(
+          crossAxisAlignment: CrossAxisAlignment.end,
+          children: [
+            Expanded(
+              child: Text('${_group.name} · $_cycleLabel · ${_plan.days} 天授权',
+                  style: TextStyle(fontSize: AppDims.fsSm, color: t.muted)),
+            ),
+            Text('¥${_fmt(_plan.price)}',
+                style: TextStyle(
+                    fontSize: 24,
+                    fontWeight: FontWeight.w700,
+                    color: t.heading,
+                    fontFamily: AppFonts.mono,
+                    fontFamilyFallback: AppFonts.monoFallback)),
+          ],
+        ),
+        const SizedBox(height: 6),
+        Text('到期时间自动叠加，未到期续费不吃亏 · 支付宝支付',
+            style: TextStyle(fontSize: AppDims.fsXs, color: t.faint)),
+      ],
+    );
+  }
+
+  Widget _buildWaiting(AppTokens t) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Row(children: [
+          SizedBox(
+            width: 18,
+            height: 18,
+            child: CircularProgressIndicator(strokeWidth: 2, color: t.primary),
+          ),
+          const SizedBox(width: 12),
+          Expanded(
+            child: Text('已在浏览器打开支付宝收银台，完成支付后本窗口会自动确认到账。',
+                style: TextStyle(fontSize: AppDims.fsSm, color: t.text)),
+          ),
+        ]),
+        const SizedBox(height: 14),
+        Container(
+          width: double.infinity,
+          padding: const EdgeInsets.all(12),
+          decoration: BoxDecoration(
+            color: t.bg,
+            border: Border.all(color: t.borderSubtle),
+            borderRadius: BorderRadius.circular(AppDims.rMd),
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text('订单号', style: TextStyle(fontSize: AppDims.fsXs, color: t.muted)),
+              const SizedBox(height: 4),
+              Text(_order?.outTradeNo ?? '—',
+                  style: const TextStyle(
+                      fontSize: AppDims.fsSm,
+                      fontFamily: AppFonts.mono,
+                      fontFamilyFallback: AppFonts.monoFallback)),
+              const SizedBox(height: 8),
+              Text('金额  ¥${_order?.amount ?? '—'}',
+                  style: TextStyle(fontSize: AppDims.fsSm, color: t.text)),
+            ],
+          ),
+        ),
+        const SizedBox(height: 10),
+        Text('关闭本窗口不影响到账：支付成功后授权自动续期，可稍后回本页刷新查看。',
+            style: TextStyle(fontSize: AppDims.fsXs, color: t.faint)),
+      ],
+    );
+  }
+
+  Widget _buildSuccess(AppTokens t) {
+    final expires = _newExpiresAt != null
+        ? DateFormat('yyyy-MM-dd').format(_newExpiresAt!)
+        : null;
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Row(children: [
+          Container(
+            width: 40,
+            height: 40,
+            decoration: BoxDecoration(
+              color: t.okSoft,
+              borderRadius: BorderRadius.circular(AppDims.rMd),
+            ),
+            child: Icon(LucideIcons.check, size: 20, color: t.success),
+          ),
+          const SizedBox(width: 12),
+          Expanded(
+            child: Text(
+                expires != null ? '门店授权已续期至 $expires。' : '门店授权已续期。',
+                style: TextStyle(
+                    fontSize: AppDims.fsTitle,
+                    fontWeight: FontWeight.w600,
+                    color: t.heading)),
+          ),
+        ]),
+        const SizedBox(height: 10),
+        Text('订单号 ${_order?.outTradeNo ?? '—'}',
+            style: TextStyle(fontSize: AppDims.fsXs, color: t.muted)),
+      ],
+    );
+  }
+
+  static String _fmt(int n) =>
+      n.toString().replaceAllMapped(RegExp(r'(\d)(?=(\d{3})+$)'), (m) => '${m[1]},');
+}
diff --git a/client/lib/screens/settings/settings_screen.dart b/client/lib/screens/settings/settings_screen.dart
index b36f63e..310de5d 100644
--- a/client/lib/screens/settings/settings_screen.dart
+++ b/client/lib/screens/settings/settings_screen.dart
@@ -32,6 +32,7 @@ import '../../widgets/ds/ds_atoms.dart';
 import '../../widgets/ds/ds_menu.dart';
 import '../../widgets/ds/ds_table.dart';
 import '../../widgets/write_guard.dart';
+import 'purchase_dialog.dart';
 import 'users_screen.dart' show userRoleBadge, userStatusBadge;
 import '../../core/theme/app_fonts.dart';
 import '../../widgets/ds/ds_toast.dart';
@@ -685,6 +686,8 @@ class _LicensePanelState extends ConsumerState<_LicensePanel> {
   Widget build(BuildContext context) {
     final t = context.tokens;
     final lic = ref.watch(licenseProvider).valueOrNull;
+    final role = ref.watch(authStateProvider.select((s) => s.user?.role));
+    final isAdmin = role == 'admin' || role == 'superadmin';
     final expires = lic?.expiresAt != null
         ? DateFormat('yyyy-MM-dd').format(lic!.expiresAt!)
         : '—';
@@ -759,14 +762,21 @@ class _LicensePanelState extends ConsumerState<_LicensePanel> {
           Row(children: [
             Text('没有兑换券？',
                 style: TextStyle(fontSize: AppDims.fsSm, color: t.muted)),
-            InkWell(
-              onTap: () => launchUrl(Uri.parse('${AppInfo.website}/#pricing')),
-              child: Text('购买授权时长 →',
-                  style: TextStyle(
-                      fontSize: AppDims.fsSm,
-                      fontWeight: FontWeight.w600,
-                      color: t.primary)),
-            ),
+            // 在线购买仅管理员（后端 purchase 接口 admin only）；其他角色引导看官网价格页
+            if (isAdmin)
+              DsButton('在线购买 / 续费',
+                  variant: DsBtnVariant.accent,
+                  onPressed: () => showPurchaseDialog(context))
+            else
+              InkWell(
+                onTap: () =>
+                    launchUrl(Uri.parse('${AppInfo.website}/#pricing')),
+                child: Text('查看套餐价格 →',
+                    style: TextStyle(
+                        fontSize: AppDims.fsSm,
+                        fontWeight: FontWeight.w600,
+                        color: t.primary)),
+              ),
           ]),
           const SizedBox(height: 16),
           // 过期降级说明（现有能力保留）
diff --git a/docs/manual/user-manual.html b/docs/manual/user-manual.html
index 92cbe42..936a9b6 100644
--- a/docs/manual/user-manual.html
+++ b/docs/manual/user-manual.html
@@ -413,7 +413,7 @@
         <tr><td><b>门店信息</b></td><td>店名、地址、电话、负责人，管理员可编辑；门店编号不可改。这些信息会印在标签和单据上。</td></tr>
         <tr><td><b>用户管理</b></td><td>新增用户（账号+初始密码+角色）、编辑、重置密码、启用/停用。四级角色见第 2 章。仅管理员可操作。</td></tr>
         <tr><td><b>编号规则</b></td><td>入库单、出库单等单号的前缀与序号。<b>不要把序号调小</b>到已用过的范围，会撞号。</td></tr>
-        <tr><td><b>授权兑换券</b></td><td>本系统按「时长兑换券」授权：输入形如 <code>JIUKU-XXXX-XXXX</code> 的短码点「兑换续期」，时长直接<b>叠加</b>到现有到期日上，无需订阅。新门店自带 30 天试用。</td></tr>
+        <tr><td><b>授权兑换券</b></td><td>本系统按「时长兑换券」授权：输入形如 <code>JIUKU-XXXX-XXXX</code> 的短码点「兑换续期」，时长直接<b>叠加</b>到现有到期日上，无需订阅。新门店自带 30 天试用。管理员也可点「在线购买 / 续费」选套餐后支付宝支付，到账自动续期。</td></tr>
         <tr><td><b>偏好设置</b></td><td>三套主题切换 + <b>默认仓库</b>（新建单据时自动选中的仓库）。</td></tr>
       </tbody>
     </table>
@@ -447,7 +447,7 @@
     <p class="faq-a">早期版本的扫码报错（502 / 页面不存在）已修复。请确认手机有网络；很旧的标签可以在库存页重打一张新标签。</p>
 
     <p class="faq-q">Q7：系统提示授权过期、变成只读了，怎么续？</p>
-    <p class="faq-a">「系统设置 → 授权兑换券」输入 <code>JIUKU-</code> 开头的兑换码点「兑换续期」，立即恢复。没有兑换码请联系客服购买。过期 15 天内数据都还在，别慌。</p>
+    <p class="faq-a">「系统设置 → 授权兑换券」输入 <code>JIUKU-</code> 开头的兑换码点「兑换续期」，或管理员点「在线购买 / 续费」支付宝支付，到账立即恢复。过期 15 天内数据都还在，别慌。</p>
 
     <p class="faq-q">Q8：进货时价格还没谈好，能先入库吗？</p>
     <p class="faq-a">能。进价留空提交即可（显示「待定价」），价格定了以后在入库单详情点「确认进价」补上，成本和应付自动补齐。出库同理，售价留空、事后「确认售价」。</p>
diff --git a/web/content/docs.md b/web/content/docs.md
index ba2ff22..bf52fda 100644
--- a/web/content/docs.md
+++ b/web/content/docs.md
@@ -133,7 +133,7 @@
 | 门店信息 | 店名/地址/电话/负责人，管理员可编辑，编号不可改 |
 | 用户管理 | 新增/编辑/重置密码/启停用户，仅管理员 |
 | 编号规则 | 单号前缀与序号；序号切勿调小，会撞号 |
-| 授权兑换券 | 输入 `JIUKU-XXXX-XXXX` 短码兑换续期，时长叠加；新店 30 天试用 |
+| 授权兑换券 | 输入 `JIUKU-XXXX-XXXX` 短码兑换续期，时长叠加；新店 30 天试用；管理员也可点「在线购买 / 续费」直接支付宝购买，到账自动续期 |
 | 偏好设置 | 主题切换 + 默认仓库 |
 
 授权过期：7 天内宽限照常用，7–15 天只读，满 15 天锁定；兑换新券立即恢复，数据不丢。
@@ -156,7 +156,7 @@
 
 **扫码打不开商品页？** 早期版本的扫码报错已修复；确认手机联网，很旧的标签可重打。
 
-**授权到期变只读？** 「系统设置 → 授权兑换券」输入 JIUKU 兑换码立即恢复；过期 15 天内数据都在。
+**授权到期变只读？** 「系统设置 → 授权兑换券」输入 JIUKU 兑换码，或管理员点「在线购买 / 续费」支付宝支付，到账立即恢复；过期 15 天内数据都在。
 
 **进价/售价还没谈好？** 价格留空即「待定价」，事后在单据详情「确认进价 / 确认售价」补填，账自动补齐。