diff --git a/ymt_v3_2/client.go b/ymt_v3_2/client.go
new file mode 100644
index 0000000..4d04274
--- /dev/null
+++ b/ymt_v3_2/client.go
@@ -0,0 +1,188 @@
+package ymt_v3_2
+
+import (
+	"bytes"
+	"context"
+	"crypto/rsa"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type Client struct {
+	httpClient *http.Client
+	baseURL    string
+	appID      string
+	privateKey *rsa.PrivateKey
+	publicKey  *rsa.PublicKey
+	aesKey     []byte
+	signType   string
+}
+
+type Option func(*Client)
+
+func WithBaseURL(url string) Option {
+	return func(c *Client) {
+		c.baseURL = url
+	}
+}
+
+func WithTimeout(d time.Duration) Option {
+	return func(c *Client) {
+		c.httpClient.Timeout = d
+	}
+}
+
+func WithHTTPClient(client *http.Client) Option {
+	return func(c *Client) {
+		c.httpClient = client
+	}
+}
+
+func WithAppID(appID string) Option {
+	return func(c *Client) {
+		c.appID = appID
+	}
+}
+
+func WithPrivateKeyPEM(pemData string) Option {
+	return func(c *Client) {
+		key, err := parsePrivateKey(pemData)
+		if err != nil {
+			panic(fmt.Sprintf("failed to parse private key: %v", err))
+		}
+		c.privateKey = key
+	}
+}
+
+func WithPublicKeyPEM(pemData string) Option {
+	return func(c *Client) {
+		key, err := parsePublicKey(pemData)
+		if err != nil {
+			panic(fmt.Sprintf("failed to parse public key: %v", err))
+		}
+		c.publicKey = key
+	}
+}
+
+func WithAESKey(key string) Option {
+	return func(c *Client) {
+		c.aesKey = []byte(key)
+	}
+}
+
+func WithSignType(signType string) Option {
+	return func(c *Client) {
+		c.signType = signType
+	}
+}
+
+func NewClient(opts ...Option) *Client {
+	c := &Client{
+		httpClient: &http.Client{Timeout: 30 * time.Second},
+		baseURL:    "https://gateway.dev.cdlsxd.cn",
+		signType:   "RSA",
+	}
+	for _, opt := range opts {
+		opt(c)
+	}
+	return c
+}
+
+func (c *Client) Do(ctx context.Context, method, path string, bizReq interface{}, bizResp interface{}) error {
+	plaintext, err := marshalSortedNoZero(bizReq)
+	if err != nil {
+		return fmt.Errorf("marshal request: %w", err)
+	}
+
+	ciphertext, err := aesEncryptECB(plaintext, c.aesKey)
+	if err != nil {
+		return fmt.Errorf("encrypt: %w", err)
+	}
+
+	timestamp := time.Now().Format("2006-01-02 15:04:05")
+
+	signStr := c.appID + timestamp + ciphertext
+	sign, err := rsaSign([]byte(signStr), c.privateKey)
+	if err != nil {
+		return fmt.Errorf("sign: %w", err)
+	}
+
+	reqBody := cipherRequest{Ciphertext: ciphertext}
+	bodyBytes, err := json.Marshal(reqBody)
+	if err != nil {
+		return fmt.Errorf("marshal request body: %w", err)
+	}
+
+	url := c.baseURL + path
+	req, err := http.NewRequestWithContext(ctx, method, url, bytes.NewReader(bodyBytes))
+	if err != nil {
+		return fmt.Errorf("create request: %w", err)
+	}
+	req.Header.Set("Appid", c.appID)
+	req.Header.Set("Timestamp", timestamp)
+	req.Header.Set("Sign", sign)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("http request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return fmt.Errorf("read response: %w", err)
+	}
+
+	var commonResp commonResponse
+	if err := json.Unmarshal(respBytes, &commonResp); err != nil {
+		return fmt.Errorf("unmarshal response: %w", err)
+	}
+
+	if commonResp.Code != 200 {
+		return &APIError{
+			Code:    commonResp.Code,
+			Message: commonResp.Message,
+			Reason:  commonResp.Reason,
+		}
+	}
+
+	if len(commonResp.Data) == 0 {
+		return nil
+	}
+
+	var cd cipherData
+	if err := json.Unmarshal(commonResp.Data, &cd); err == nil && cd.Ciphertext != "" {
+		decrypted, err := aesDecryptECB(cd.Ciphertext, c.aesKey)
+		if err != nil {
+			return fmt.Errorf("decrypt response: %w", err)
+		}
+		if err := json.Unmarshal(decrypted, bizResp); err != nil {
+			return fmt.Errorf("unmarshal decrypted response: %w", err)
+		}
+	} else {
+		if err := json.Unmarshal(commonResp.Data, bizResp); err != nil {
+			return fmt.Errorf("unmarshal plain data: %w", err)
+		}
+	}
+
+	return nil
+}
+
+type cipherRequest struct {
+	Ciphertext string `json:"ciphertext"`
+}
+
+type commonResponse struct {
+	Code    int32           `json:"code"`
+	Message string          `json:"message"`
+	Reason  string          `json:"reason,omitempty"`
+	Data    json.RawMessage `json:"data,omitempty"`
+}
+
+type cipherData struct {
+	Ciphertext string `json:"ciphertext"`
+}
\ No newline at end of file