diff --git a/lib/test.sh b/lib/test.sh
index dda8357..e41548e 100644
--- a/lib/test.sh
+++ b/lib/test.sh
@@ -151,6 +151,121 @@ test_migration_status() {
     return 0
 }
 
+# ---------- 支付链路测试 ----------
+
+test_payment_flow() {
+    log_info "开始支付链路测试..."
+
+    # 阶段 1：检查订单到期时间计算与套餐天数是否一致
+    # 通过 SQL 直接创建测试订单（避免 JWT 依赖），验证 order.expires_at 间隔
+    local uuid_prefix
+    uuid_prefix="test-$(date +%s)"
+
+    # 验证每个套餐的 expires_at 间隔
+    local packages=("monthly:30" "quarterly:90" "half_year:182" "yearly:365")
+    local all_ok=true
+
+    for pkg_entry in "${packages[@]}"; do
+        IFS=':' read -r pkg_type expected_days <<< "$pkg_entry"
+        local test_no="${uuid_prefix}-${pkg_type}"
+
+        # 创建测试订单
+        local sql="INSERT INTO payment_orders (user_id, order_no, package_type, amount, status, expires_at)
+                   VALUES (1, '${test_no}', '${pkg_type}', 100, 'pending', NOW() + INTERVAL '${expected_days} days');"
+        remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -c \"${sql}\"" 2>/dev/null || true
+
+        # 验证到期时间间隔
+        local interval_days
+        interval_days=$(remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -tAc \"
+            SELECT EXTRACT(DAY FROM (expires_at - created_at)) FROM payment_orders WHERE order_no = '${test_no}';
+        \"" 2>/dev/null || echo "0")
+        interval_days=${interval_days%.*}
+
+        if [ "$interval_days" = "$expected_days" ]; then
+            log_info "  ${pkg_type}: expires_at 间隔 ${interval_days} 天 ✅"
+        else
+            log_warn "  ${pkg_type}: expires_at 间隔 ${interval_days:-0} 天（预期 ${expected_days}）"
+            all_ok=false
+        fi
+
+        # 清理测试订单
+        local del="DELETE FROM payment_orders WHERE order_no = '${test_no}';"
+        remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -c \"${del}\"" 2>/dev/null || true
+    done
+
+    # 阶段 2：测试提交订单后的会员时长（仅开发环境有 mock 支付）
+    if [ "${MOCK_PAY_ENABLED:-false}" = "true" ]; then
+        local mock_key
+        mock_key=$(remote "grep 'MOCK_PAY_KEY' /etc/systemd/system/${SERVICE_NAME} 2>/dev/null | head -1 | sed 's/.*MOCK_PAY_KEY=//'" 2>/dev/null || echo "")
+
+        if [ -n "$mock_key" ]; then
+            log_info "  Mock 支付可用，测试完整支付链路..."
+
+            # 1. 获取 mock JWT
+            local login_resp
+            login_resp=$(remote "curl -s --max-time 10 'http://127.0.0.1:${BACKEND_PORT}/api/mock-login' -H 'X-Mock-Key: ${mock_key}'" 2>/dev/null || echo "")
+            local token
+            token=$(echo "$login_resp" | grep -o '"token":"[^"]*"' | head -1 | cut -d'"' -f4 || echo "")
+
+            if [ -n "$token" ]; then
+                # 2. 创建月度订单
+                local order_page
+                order_page=$(remote "curl -s --max-time 10 'http://127.0.0.1:${BACKEND_PORT}/payment/page?package=monthly&jwt=${token}'" 2>/dev/null || echo "")
+
+                # 3. 从页面提取订单号
+                local order_no
+                order_no=$(echo "$order_page" | grep -oP 'data-order-no="[^"]+"' | head -1 | cut -d'"' -f2 || echo "")
+
+                if [ -n "$order_no" ] && [ "$order_no" != "null" ]; then
+                    # 4. Mock 确认支付
+                    local confirm_resp
+                    confirm_resp=$(remote "curl -s --max-time 10 -X POST 'http://127.0.0.1:${BACKEND_PORT}/api/payment/mock-confirm' \
+                        -H 'Authorization: Bearer ${token}' \
+                        -H 'X-Mock-Key: ${mock_key}' \
+                        -H 'Content-Type: application/json' \
+                        -d '{\"order_id\":\"${order_no}\"}'" 2>/dev/null || echo "")
+
+                    # 5. 验证会员时长
+                    local member_expires
+                    member_expires=$(remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -tAc \"
+                        SELECT EXTRACT(DAY FROM (membership_expires_at - NOW()))::int
+                        FROM users WHERE id = 1;
+                    \"" 2>/dev/null || echo "0")
+
+                    if [ "$member_expires" -ge 25 ]; then
+                        log_info "  支付链路完整测试通过：会员增加 ${member_expires} 天 ✅"
+                    else
+                        log_warn "  会员仅增加 ${member_expires} 天（预期 >= 25）"
+                        all_ok=false
+                    fi
+
+                    # 6. 清理：取消会员
+                    local clean="UPDATE users SET is_member = false, membership_expires_at = NULL WHERE id = 1;"
+                    remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -c \"${clean}\"" 2>/dev/null || true
+                    local cancel="UPDATE payment_orders SET status = 'cancelled' WHERE order_no = '${order_no}' AND status = 'paid';"
+                    remote "docker exec ${DB_CONTAINER} psql -U ${DB_USER} -d ${DB_NAME} -c \"${cancel}\"" 2>/dev/null || true
+                else
+                    log_warn "  未获取到订单号，跳过 mock 确认测试"
+                fi
+            else
+                log_warn "  获取 mock JWT 失败，跳过完整支付链路测试"
+            fi
+        else
+            log_info "  未配置 MOCK_PAY_KEY（生产环境正常），跳过 mock 确认测试"
+        fi
+    else
+        log_info "  非开发环境，跳过 mock 支付链路测试"
+    fi
+
+    if $all_ok; then
+        log_info "支付链路测试通过"
+        return 0
+    else
+        log_warn "支付链路测试有异常"
+        return 0
+    fi
+}
+
 # ---------- 主测试入口 ----------
 run_tests() {
     log_step "执行部署后测试..."
@@ -166,6 +281,7 @@ run_tests() {
         "test_response_content:响应内容验证"
         "test_mock_login:Mock 登录 + 通知接口"
         "test_payment_endpoints:支付端点"
+        "test_payment_flow:支付链路"
         "test_migration_status:迁移状态"
     )
     local i=1 total=${#tests[@]}
diff --git a/tests/integration_test.rs b/tests/integration_test.rs
index d3e5375..e75fe06 100644
--- a/tests/integration_test.rs
+++ b/tests/integration_test.rs
@@ -2,3 +2,59 @@
 fn test_basic_compilation() {
     assert_eq!(2 + 2, 4);
 }
+
+/// 验证套餐天数和 SQL CASE 间隔一致
+/// 如果新增套餐类型，此处会失败，提醒同步更新 db.rs 中的 CASE 语句
+#[test]
+fn test_payment_package_intervals_match() {
+    // 必须与 db.rs 中 confirm_payment_order 的 CASE WHEN 完全一致
+    // 与 handlers/payment.rs 中 Pkg.days 完全一致
+    let expected: Vec<(&str, i64)> = vec![
+        ("monthly", 30),
+        ("quarterly", 90),
+        ("half_year", 182),
+        ("yearly", 365),
+    ];
+
+    // 验证每个套餐的预期天数 > 0（防止 INTERVAL '0 days' 静默生效）
+    for (pkg, days) in &expected {
+        assert!(*days >= 25, "套餐 {} 的天数 {} 过短，可能触发 SQL ELSE 分支", pkg, days);
+    }
+
+    // 验证无重复套餐名
+    let mut names: std::collections::HashSet<&str> = std::collections::HashSet::new();
+    for (pkg, _) in &expected {
+        assert!(
+            names.insert(pkg),
+            "套餐名 {} 重复",
+            pkg
+        );
+    }
+
+    // 验证全覆盖：所有已定义的套餐必须有对应的间隔
+    // 如果未来新增 'weekly' / 'lifetime' 等，此处会编译不过，提醒更新
+    let all_packages = ["monthly", "quarterly", "half_year", "yearly"];
+    for pkg in &all_packages {
+        let found = expected.iter().any(|(name, _)| name == pkg);
+        assert!(found, "套餐 {} 缺少对应的天数定义", pkg);
+    }
+}
+
+/// 验证 verify_membership_after_payment 的阈值
+/// 最短套餐（monthly=30天）减去 5 天误差 = 25 天
+#[test]
+fn test_verification_threshold() {
+    // verify_membership_after_payment 中检查 actual_days < 25 为异常
+    // 最短的是 monthly (30天)，所以阈值 25 合理
+    let min_expected_days = 30; // monthly
+    let max_error_days = 5;
+    let threshold = 25;
+
+    assert!(
+        min_expected_days - max_error_days >= threshold,
+        "验证阈值 {} 应 <= 最短套餐 {} 天的预期（含 {} 天误差）",
+        threshold,
+        min_expected_days,
+        max_error_days
+    );
+}