diff --git a/sdk_tb_linkedmall/client.go b/sdk_tb_linkedmall/client.go
new file mode 100644
index 0000000..b5b3d7a
--- /dev/null
+++ b/sdk_tb_linkedmall/client.go
@@ -0,0 +1,674 @@
+package sdk_tb_linkedmall
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+
+	openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
+	"github.com/alibabacloud-go/tea"
+)
+
+// Client 是LinkedMall SDK客户端，封装了所有API方法
+type Client struct {
+	openapiClient *openapi.Client
+	basePath      string
+}
+
+// NewClient 创建LinkedMall SDK客户端
+//   - accessKeyId: RAM子账号的AccessKeyId
+//   - accessKeySecret: RAM子账号的AccessKeySecret
+func NewClient(accessKeyId, accessKeySecret string) (*Client, error) {
+	config := &openapi.Config{
+		AccessKeyId:     tea.String(accessKeyId),
+		AccessKeySecret: tea.String(accessKeySecret),
+		RegionId:        tea.String("cn-zhangjiakou"),
+		Endpoint:        tea.String("linkedmall.cn-zhangjiakou.aliyuncs.com"),
+		ReadTimeout:     tea.Int(30000),
+		ConnectTimeout:  tea.Int(10000),
+	}
+	apiClient, err := openapi.NewClient(config)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create openapi client: %w", err)
+	}
+	return &Client{
+		openapiClient: apiClient,
+		basePath:      "/opensaas-s2b/opensaas-s2b-biz-trade/v2",
+	}, nil
+}
+
+// doRequest 执行ROA请求，并解析公共响应体
+func (c *Client) doRequest(method, path string, query map[string]string, body interface{}) (*CommonResponse, error) {
+	// 转换query为map[string]*string
+	teaQuery := make(map[string]*string, len(query))
+	for k, v := range query {
+		if v != "" {
+			teaQuery[k] = tea.String(v)
+		}
+	}
+
+	fullPath := c.basePath + path
+
+	respBytes, err := c.openapiClient.RoaRequest(
+		tea.String(method),
+		tea.String(fullPath),
+		teaQuery,
+		body,
+		nil,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("roa request failed: %w", err)
+	}
+
+	var commonResp CommonResponse
+	if err := json.Unmarshal(respBytes, &commonResp); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &commonResp, nil
+}
+
+// parseData 将CommonResponse的Data字段解析到目标结构体
+func parseData(commonResp *CommonResponse, target interface{}) error {
+	dataBytes, err := json.Marshal(commonResp.Data)
+	if err != nil {
+		return fmt.Errorf("failed to marshal data: %w", err)
+	}
+	if err := json.Unmarshal(dataBytes, target); err != nil {
+		return fmt.Errorf("failed to unmarshal data: %w", err)
+	}
+	return nil
+}
+
+// ============================================================
+// 接口1：ListPurchaserShops - 分页获取采购方店铺列表
+// ============================================================
+
+// ListPurchaserShops 分页获取采购方店铺列表
+func (c *Client) ListPurchaserShops(req *ListPurchaserShopsReq) (*CommonResponse, *ListPurchaserShopsRespData, error) {
+	query := make(map[string]string)
+	if req.PageNum > 0 {
+		query["PageNum"] = strconv.Itoa(req.PageNum)
+	}
+	if req.PageSize > 0 {
+		query["PageSize"] = strconv.Itoa(req.PageSize)
+	}
+
+	commonResp, err := c.doRequest("GET", "/purchaser-shops", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListPurchaserShopsRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口2：GetPurchaserShop - 获取单个采购店铺详情
+// ============================================================
+
+// GetPurchaserShop 获取单个采购店铺详情
+func (c *Client) GetPurchaserShop(shopId string) (*CommonResponse, *GetPurchaserShopRespData, error) {
+	query := make(map[string]string)
+
+	commonResp, err := c.doRequest("GET", "/purchaser-shops/"+shopId, query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetPurchaserShopRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口3：ListSelectionProducts - 分页查询选品池商品列表
+// ============================================================
+
+// ListSelectionProducts 分页查询选品池商品列表
+func (c *Client) ListSelectionProducts(req *ListSelectionProductsReq) (*CommonResponse, *ListSelectionProductsRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = req.PurchaserId
+	if req.PageNum > 0 {
+		query["PageNum"] = strconv.Itoa(req.PageNum)
+	}
+	if req.PageSize > 0 {
+		query["PageSize"] = strconv.Itoa(req.PageSize)
+	}
+
+	commonResp, err := c.doRequest("GET", "/selection-products", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListSelectionProductsRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口4：GetSelectionProduct - 查询选品池商品详情
+// ============================================================
+
+// GetSelectionProduct 查询选品池商品详情
+//   - divisionCode: 可选，五级乡镇区域编码，传入后返回该区域可售状态
+func (c *Client) GetSelectionProduct(req *GetSelectionProductReq) (*CommonResponse, *GetSelectionProductRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = req.PurchaserId
+	if req.DivisionCode != "" {
+		query["DivisionCode"] = req.DivisionCode
+	}
+
+	commonResp, err := c.doRequest("GET", "/selection-products/"+req.ProductId, query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetSelectionProductRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口5：GetSelectionProductSaleInfo - 查询选品池商品销售信息
+// ============================================================
+
+// GetSelectionProductSaleInfo 查询选品池商品销售信息
+func (c *Client) GetSelectionProductSaleInfo(req *GetSelectionProductSaleInfoReq) (*CommonResponse, *GetSelectionProductSaleInfoRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = req.PurchaserId
+	if req.DivisionCode != "" {
+		query["DivisionCode"] = req.DivisionCode
+	}
+
+	commonResp, err := c.doRequest("GET", "/selection-products/"+req.ProductId+"/sale-info", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetSelectionProductSaleInfoRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口6：ListSelectionProductSaleInfos - 批量查询商品销售信息
+// ============================================================
+
+// ListSelectionProductSaleInfos 批量查询商品销售信息
+func (c *Client) ListSelectionProductSaleInfos(req *ListSelectionProductSaleInfosReq) (*CommonResponse, *ListSelectionProductSaleInfosRespData, error) {
+	commonResp, err := c.doRequest("POST", "/selection-products:batch-sale-info", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListSelectionProductSaleInfosRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口7：ListSelectionSkuSaleInfos - 批量SKU销售信息
+// ============================================================
+
+// ListSelectionSkuSaleInfos 批量查询SKU销售信息
+func (c *Client) ListSelectionSkuSaleInfos(req *ListSelectionSkuSaleInfosReq) (*CommonResponse, *ListSelectionSkuSaleInfosRespData, error) {
+	commonResp, err := c.doRequest("POST", "/selection-skus:batch-sale-info", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListSelectionSkuSaleInfosRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口8：ListCategories - 查询类目列表
+// ============================================================
+
+// ListCategories 查询类目列表
+//   - parentCategoryId: 父类目ID，不传时查询一级类目
+func (c *Client) ListCategories(req *ListCategoriesReq) (*CommonResponse, *ListCategoriesRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = req.PurchaserId
+	if req.ParentCategoryId != "" {
+		query["ParentCategoryId"] = req.ParentCategoryId
+	}
+
+	commonResp, err := c.doRequest("GET", "/categories", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListCategoriesRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口9：SearchProducts - 搜索选品池商品
+// ============================================================
+
+// SearchProducts 搜索选品池商品
+func (c *Client) SearchProducts(req *SearchProductsReq) (*CommonResponse, *SearchProductsRespData, error) {
+	commonResp, err := c.doRequest("POST", "/selection-products:search", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data SearchProductsRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口10：SelectionGroupAddProduct - 选品池商品入库
+// ============================================================
+
+// SelectionGroupAddProduct 选品池商品入库
+func (c *Client) SelectionGroupAddProduct(req *SelectionGroupAddProductReq) (*CommonResponse, error) {
+	commonResp, err := c.doRequest("POST", "/selection-group/products:add", nil, req)
+	if err != nil {
+		return nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, err
+	}
+	return commonResp, nil
+}
+
+// ============================================================
+// 接口11：SelectionGroupRemoveProduct - 选品池商品出库
+// ============================================================
+
+// SelectionGroupRemoveProduct 选品池商品出库
+func (c *Client) SelectionGroupRemoveProduct(req *SelectionGroupRemoveProductReq) (*CommonResponse, error) {
+	commonResp, err := c.doRequest("POST", "/selection-group/products:remove", nil, req)
+	if err != nil {
+		return nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, err
+	}
+	return commonResp, nil
+}
+
+// ============================================================
+// 接口12：RenderPurchaseOrder - 采购单渲染（下单预校验）
+// ============================================================
+
+// RenderPurchaseOrder 采购单渲染（下单预校验）
+// 下单前必须调用，获取实时价格、校验商品是否可售
+func (c *Client) RenderPurchaseOrder(req *RenderPurchaseOrderReq) (*CommonResponse, *RenderPurchaseOrderRespData, error) {
+	commonResp, err := c.doRequest("POST", "/purchase-orders:render", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data RenderPurchaseOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口13：SplitPurchaseOrder - 采购单渲染并拆单
+// ============================================================
+
+// SplitPurchaseOrder 采购单渲染并拆单
+// 返回拆成多份子单结构，用于前端展示，拆单结果用于创建采购单入参
+func (c *Client) SplitPurchaseOrder(req *SplitPurchaseOrderReq) (*CommonResponse, *SplitPurchaseOrderRespData, error) {
+	commonResp, err := c.doRequest("POST", "/purchase-orders:split-render", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data SplitPurchaseOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口14：CreatePurchaseOrder - 创建采购单【异步】
+// ============================================================
+
+// CreatePurchaseOrder 创建采购单【异步】
+// 重要：接口只返回采购单号，不代表下单成功，必须等待回调通知，再查询订单接口
+func (c *Client) CreatePurchaseOrder(req *CreatePurchaseOrderReq) (*CommonResponse, *CreatePurchaseOrderRespData, error) {
+	commonResp, err := c.doRequest("POST", "/purchase-orders", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data CreatePurchaseOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口15：GetPurchaseOrderStatus - 获取采购单状态
+// ============================================================
+
+// GetPurchaseOrderStatus 获取采购单状态
+// 状态枚举：INIT、PROCESS、SUCCESS、FAIL、CLOSED
+func (c *Client) GetPurchaseOrderStatus(purchaseOrderId, purchaserId string) (*CommonResponse, *GetPurchaseOrderStatusRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = purchaserId
+
+	commonResp, err := c.doRequest("GET", "/purchase-orders/"+purchaseOrderId+"/status", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetPurchaseOrderStatusRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口16：GetOrder - 获取订单详情
+// ============================================================
+
+// GetOrder 获取订单详情
+func (c *Client) GetOrder(orderId, purchaserId string) (*CommonResponse, *GetOrderRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = purchaserId
+
+	commonResp, err := c.doRequest("GET", "/orders/"+orderId, query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口17：QueryOrders - 查询订单列表
+// ============================================================
+
+// QueryOrders 查询订单列表
+func (c *Client) QueryOrders(req *QueryOrdersReq) (*CommonResponse, *QueryOrdersRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = req.PurchaserId
+	if req.PurchaseOrderId != "" {
+		query["PurchaseOrderId"] = req.PurchaseOrderId
+	}
+	if req.PageNum > 0 {
+		query["PageNum"] = strconv.Itoa(req.PageNum)
+	}
+	if req.PageSize > 0 {
+		query["PageSize"] = strconv.Itoa(req.PageSize)
+	}
+	if req.StartTime != "" {
+		query["StartTime"] = req.StartTime
+	}
+	if req.EndTime != "" {
+		query["EndTime"] = req.EndTime
+	}
+
+	commonResp, err := c.doRequest("GET", "/orders", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data QueryOrdersRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口18：ListLogisticsOrders - 查询订单物流信息
+// ============================================================
+
+// ListLogisticsOrders 查询订单物流信息
+func (c *Client) ListLogisticsOrders(orderId, purchaserId string) (*CommonResponse, *ListLogisticsOrdersRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = purchaserId
+
+	commonResp, err := c.doRequest("GET", "/orders/"+orderId+"/logistics", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data ListLogisticsOrdersRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口19：ConfirmDisburse - 确认收货
+// ============================================================
+
+// ConfirmDisburse 确认收货
+func (c *Client) ConfirmDisburse(orderId, purchaserId string) (*CommonResponse, error) {
+	body := map[string]string{
+		"PurchaserId": purchaserId,
+	}
+
+	commonResp, err := c.doRequest("POST", "/orders/"+orderId+":confirm-disburse", nil, body)
+	if err != nil {
+		return nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, err
+	}
+	return commonResp, nil
+}
+
+// ============================================================
+// 接口20：RenderRefundOrder - 售后渲染预校验
+// ============================================================
+
+// RenderRefundOrder 售后渲染预校验
+func (c *Client) RenderRefundOrder(req *RenderRefundOrderReq) (*CommonResponse, *RenderRefundOrderRespData, error) {
+	commonResp, err := c.doRequest("POST", "/refund-orders:render", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data RenderRefundOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口21：CreateRefundOrder - 创建售后单
+// ============================================================
+
+// CreateRefundOrder 创建售后单
+func (c *Client) CreateRefundOrder(req *CreateRefundOrderReq) (*CommonResponse, *CreateRefundOrderRespData, error) {
+	commonResp, err := c.doRequest("POST", "/refund-orders", nil, req)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data CreateRefundOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口22：CancelRefundOrder - 取消售后单
+// ============================================================
+
+// CancelRefundOrder 取消售后单
+func (c *Client) CancelRefundOrder(refundOrderId, purchaserId string) (*CommonResponse, error) {
+	body := map[string]string{
+		"PurchaserId": purchaserId,
+	}
+
+	commonResp, err := c.doRequest("POST", "/refund-orders/"+refundOrderId+":cancel", nil, body)
+	if err != nil {
+		return nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, err
+	}
+	return commonResp, nil
+}
+
+// ============================================================
+// 接口23：GetRefundOrder - 获取售后单详情
+// ============================================================
+
+// GetRefundOrder 获取售后单详情
+func (c *Client) GetRefundOrder(refundOrderId, purchaserId string) (*CommonResponse, *GetRefundOrderRespData, error) {
+	query := make(map[string]string)
+	query["PurchaserId"] = purchaserId
+
+	commonResp, err := c.doRequest("GET", "/refund-orders/"+refundOrderId, query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data GetRefundOrderRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
+
+// ============================================================
+// 接口24：CreateGoodsShippingNotice - 回填退货物流运单
+// ============================================================
+
+// CreateGoodsShippingNotice 回填退货物流运单
+func (c *Client) CreateGoodsShippingNotice(refundOrderId, purchaserId, logisticsCompany, trackingNumber string) (*CommonResponse, error) {
+	body := map[string]string{
+		"PurchaserId":      purchaserId,
+		"LogisticsCompany": logisticsCompany,
+		"TrackingNumber":   trackingNumber,
+	}
+
+	commonResp, err := c.doRequest("POST", "/refund-orders/"+refundOrderId+":fill-logistics", nil, body)
+	if err != nil {
+		return nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, err
+	}
+	return commonResp, nil
+}
+
+// ============================================================
+// 接口25：QueryChildDivisionCode - 查询子区域编码
+// ============================================================
+
+// QueryChildDivisionCode 查询子区域编码
+// 不传返回省级；传入省返回市，传入市返回区，传入区返回乡镇（五级）
+func (c *Client) QueryChildDivisionCode(parentDivisionCode string) (*CommonResponse, *QueryChildDivisionCodeRespData, error) {
+	query := make(map[string]string)
+	if parentDivisionCode != "" {
+		query["ParentDivisionCode"] = parentDivisionCode
+	}
+
+	commonResp, err := c.doRequest("GET", "/divisions:children", query, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := CheckResponse(commonResp); err != nil {
+		return commonResp, nil, err
+	}
+
+	var data QueryChildDivisionCodeRespData
+	if err := parseData(commonResp, &data); err != nil {
+		return commonResp, nil, err
+	}
+	return commonResp, &data, nil
+}
\ No newline at end of file