commit c9d007497b80240beaa606334bd6970e4f23bbb7
Author: shiran <admin@example.com>
Date:   Fri Jul 10 17:18:58 2026 +0800

    Initial 007Pay Go SDK

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2d751c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+/bin/
+/dist/
+*.exe
+*.test
+coverage.out
+.env
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2dea157
--- /dev/null
+++ b/README.md
@@ -0,0 +1,147 @@
+# 007Pay Go Merchant SDK / CLI
+
+这是 007Pay 商户应用端 Go SDK，包含：
+
+- `pay007` SDK 包：创建订单、查询订单、退款、订单列表、手动入账、收益统计
+- `007pay` CLI：可在其他项目或脚本中快速调试接入
+- 与平台一致的 `pid + key + MD5` 签名工具
+
+## 安装
+
+作为独立子项目使用：
+
+```bash
+cd merchant-sdk-go
+go test ./...
+go build -o bin/007pay ./cmd/007pay
+```
+
+发布到自己的 Git 仓库后，其他项目可直接引入：
+
+```bash
+go get gitea.s1f.ren/shiran/007pay-sdk.git
+```
+
+## SDK 用法
+
+```go
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	pay007 "gitea.s1f.ren/shiran/007pay-sdk.git"
+)
+
+func main() {
+	client, err := pay007.NewClient(
+		"http://127.0.0.1:8081",
+		"your-pid",
+		"your-secret-key",
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	order, err := client.Submit(context.Background(), pay007.SubmitRequest{
+		OutTradeNo: "M202607100001",
+		Name:       "测试订单",
+		Money:      "0.01",
+		Type:       "alipay",
+		ClientType: "pc",
+		NotifyURL:  "https://merchant.example.com/pay/notify",
+		ReturnURL:  "https://merchant.example.com/pay/return",
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println(order.CashierURL)
+}
+```
+
+查询订单会调用平台商户查询接口；平台侧会在待支付时主动通过通道查询订单状态，例如支付宝会走 `alipay.trade.query`，并返回 `completed` 与 `channel_checked`。
+
+```go
+result, err := client.Query(context.Background(), pay007.QueryRequest{
+	OutTradeNo: "M202607100001",
+})
+if err != nil {
+	log.Fatal(err)
+}
+if result.Completed {
+	fmt.Println("paid")
+}
+```
+
+## CLI 用法
+
+CLI 支持环境变量：
+
+```bash
+export PAY007_BASE_URL=http://127.0.0.1:8081
+export PAY007_PID=your-pid
+export PAY007_KEY=your-secret-key
+```
+
+创建订单：
+
+```bash
+007pay submit \
+  --out-trade-no M202607100001 \
+  --name "测试订单" \
+  --money 0.01 \
+  --type alipay \
+  --clienttype pc \
+  --notify-url https://merchant.example.com/pay/notify \
+  --return-url https://merchant.example.com/pay/return
+```
+
+查询订单：
+
+```bash
+007pay query --out-trade-no M202607100001
+```
+
+退款：
+
+```bash
+007pay refund --out-trade-no M202607100001 --money 0.01 --reason "用户退款"
+```
+
+订单列表：
+
+```bash
+007pay orders --status 1 --page 1 --page-size 20
+```
+
+收益统计：
+
+```bash
+007pay stats --begin "2026-07-01 00:00:00" --end "2026-07-31 23:59:59"
+```
+
+签名调试：
+
+```bash
+007pay sign out_trade_no=M202607100001 name=测试订单 money=0.01 type=alipay
+```
+
+## 签名规则
+
+与平台 `utils/sign` 保持一致：
+
+1. 过滤空值、`sign`、`sign_type`
+2. 参数按 key 升序排序
+3. 拼接为 `a=1&b=2`
+4. 末尾追加应用密钥
+5. MD5 后转大写
+
+SDK 中可直接使用：
+
+```go
+sign := pay007.BuildSign(params, secret)
+ok := pay007.VerifySign(params, secret)
+```
diff --git a/client.go b/client.go
new file mode 100644
index 0000000..97a332d
--- /dev/null
+++ b/client.go
@@ -0,0 +1,243 @@
+package pay007
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const defaultUserAgent = "007pay-go-sdk/1.0"
+
+type Client struct {
+	baseURL    string
+	pid        string
+	secret     string
+	httpClient *http.Client
+	userAgent  string
+}
+
+type Option func(*Client)
+
+func WithHTTPClient(httpClient *http.Client) Option {
+	return func(c *Client) {
+		if httpClient != nil {
+			c.httpClient = httpClient
+		}
+	}
+}
+
+func WithTimeout(timeout time.Duration) Option {
+	return func(c *Client) {
+		if timeout > 0 {
+			c.httpClient.Timeout = timeout
+		}
+	}
+}
+
+func WithUserAgent(userAgent string) Option {
+	return func(c *Client) {
+		if strings.TrimSpace(userAgent) != "" {
+			c.userAgent = userAgent
+		}
+	}
+}
+
+func NewClient(baseURL, pid, secret string, opts ...Option) (*Client, error) {
+	baseURL = strings.TrimRight(strings.TrimSpace(baseURL), "/")
+	if baseURL == "" {
+		return nil, errors.New("baseURL is required")
+	}
+	if _, err := url.ParseRequestURI(baseURL); err != nil {
+		return nil, fmt.Errorf("invalid baseURL: %w", err)
+	}
+	if strings.TrimSpace(pid) == "" {
+		return nil, errors.New("pid is required")
+	}
+	if strings.TrimSpace(secret) == "" {
+		return nil, errors.New("secret is required")
+	}
+
+	c := &Client{
+		baseURL: baseURL,
+		pid:     pid,
+		secret:  secret,
+		httpClient: &http.Client{
+			Timeout: 15 * time.Second,
+		},
+		userAgent: defaultUserAgent,
+	}
+	for _, opt := range opts {
+		opt(c)
+	}
+	return c, nil
+}
+
+func (c *Client) Sign(params map[string]string) string {
+	return BuildSign(params, c.secret)
+}
+
+func (c *Client) Verify(params map[string]string) bool {
+	return VerifySign(params, c.secret)
+}
+
+func (c *Client) Submit(ctx context.Context, req SubmitRequest) (*SubmitResponse, error) {
+	var out SubmitResponse
+	if err := c.doSigned(ctx, http.MethodPost, "/api/pay/submit", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) Query(ctx context.Context, req QueryRequest) (*QueryResponse, error) {
+	var out QueryResponse
+	if err := c.doSigned(ctx, http.MethodGet, "/api/pay/query", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) Refund(ctx context.Context, req RefundRequest) (*RefundResponse, error) {
+	var out RefundResponse
+	if err := c.doSigned(ctx, http.MethodPost, "/api/pay/refund", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) Orders(ctx context.Context, req OrdersRequest) (*OrdersResponse, error) {
+	var out OrdersResponse
+	if err := c.doSigned(ctx, http.MethodGet, "/api/pay/orders", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) Manual(ctx context.Context, req ManualRequest) (*ManualResponse, error) {
+	var out ManualResponse
+	if err := c.doSigned(ctx, http.MethodPost, "/api/pay/manual", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) Stats(ctx context.Context, req StatsRequest) (*StatsResponse, error) {
+	var out StatsResponse
+	if err := c.doSigned(ctx, http.MethodGet, "/api/pay/stats", req.params(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+func (c *Client) doSigned(ctx context.Context, method, path string, params map[string]string, out any) error {
+	signed := compactParams(params)
+	signed["pid"] = c.pid
+	signed["sign_type"] = "MD5"
+	signed["sign"] = BuildSign(signed, c.secret)
+
+	values := url.Values{}
+	for k, v := range signed {
+		values.Set(k, v)
+	}
+
+	endpoint := c.baseURL + path
+	var body io.Reader
+	if method == http.MethodGet {
+		endpoint += "?" + values.Encode()
+	} else {
+		body = bytes.NewBufferString(values.Encode())
+	}
+
+	httpReq, err := http.NewRequestWithContext(ctx, method, endpoint, body)
+	if err != nil {
+		return err
+	}
+	httpReq.Header.Set("Accept", "application/json")
+	httpReq.Header.Set("User-Agent", c.userAgent)
+	if method != http.MethodGet {
+		httpReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	}
+
+	resp, err := c.httpClient.Do(httpReq)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	var envelope struct {
+		Code    int             `json:"code"`
+		Message string          `json:"message"`
+		Data    json.RawMessage `json:"data"`
+	}
+	if err := json.Unmarshal(respBody, &envelope); err != nil {
+		return &APIError{
+			HTTPStatus: resp.StatusCode,
+			Code:       0,
+			Message:    "invalid json response: " + err.Error(),
+			Body:       string(respBody),
+		}
+	}
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 || envelope.Code != 200 {
+		return &APIError{
+			HTTPStatus: resp.StatusCode,
+			Code:       envelope.Code,
+			Message:    envelope.Message,
+			Body:       string(respBody),
+		}
+	}
+
+	if out == nil || len(envelope.Data) == 0 || string(envelope.Data) == "null" {
+		return nil
+	}
+	if err := json.Unmarshal(envelope.Data, out); err != nil {
+		return &APIError{
+			HTTPStatus: resp.StatusCode,
+			Code:       envelope.Code,
+			Message:    "invalid data response: " + err.Error(),
+			Body:       string(respBody),
+		}
+	}
+	return nil
+}
+
+type APIError struct {
+	HTTPStatus int
+	Code       int
+	Message    string
+	Body       string
+}
+
+func (e *APIError) Error() string {
+	if e == nil {
+		return ""
+	}
+	return fmt.Sprintf("007pay api error: http=%d code=%d message=%s", e.HTTPStatus, e.Code, e.Message)
+}
+
+func compactParams(params map[string]string) map[string]string {
+	out := make(map[string]string, len(params))
+	for k, v := range params {
+		if strings.TrimSpace(k) == "" || v == "" {
+			continue
+		}
+		out[k] = v
+	}
+	return out
+}
+
+func itoa(v int) string {
+	return strconv.Itoa(v)
+}
diff --git a/client_test.go b/client_test.go
new file mode 100644
index 0000000..75ac5ad
--- /dev/null
+++ b/client_test.go
@@ -0,0 +1,69 @@
+package pay007
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestSubmitPostsSignedForm(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/pay/submit" {
+			t.Fatalf("path = %s", r.URL.Path)
+		}
+		if r.Method != http.MethodPost {
+			t.Fatalf("method = %s", r.Method)
+		}
+		if err := r.ParseForm(); err != nil {
+			t.Fatal(err)
+		}
+
+		params := map[string]string{}
+		for k, v := range r.PostForm {
+			if len(v) > 0 {
+				params[k] = v[0]
+			}
+		}
+		if params["pid"] != "pid-1" {
+			t.Fatalf("pid = %s", params["pid"])
+		}
+		if params["sign_type"] != "MD5" {
+			t.Fatalf("sign_type = %s", params["sign_type"])
+		}
+		if !VerifySign(params, "secret") {
+			t.Fatalf("invalid sign: %s", params["sign"])
+		}
+
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"code":    200,
+			"message": "Success",
+			"data": map[string]any{
+				"order_no":     "P123",
+				"out_trade_no": params["out_trade_no"],
+				"amount":       100,
+				"cashier_url":  "http://pay.test/cashier/?orderNo=P123",
+			},
+		})
+	}))
+	defer server.Close()
+
+	client, err := NewClient(server.URL, "pid-1", "secret")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := client.Submit(context.Background(), SubmitRequest{
+		OutTradeNo: "A100",
+		Name:       "test",
+		Money:      "1.00",
+		Type:       "alipay",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.OrderNo != "P123" || resp.Amount != 100 {
+		t.Fatalf("unexpected response: %+v", resp)
+	}
+}
diff --git a/cmd/007pay/main.go b/cmd/007pay/main.go
new file mode 100644
index 0000000..8119390
--- /dev/null
+++ b/cmd/007pay/main.go
@@ -0,0 +1,303 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	pay007 "gitea.s1f.ren/shiran/007pay-sdk.git"
+)
+
+type globalConfig struct {
+	BaseURL string
+	PID     string
+	Key     string
+	Timeout time.Duration
+}
+
+func main() {
+	if err := run(os.Args[1:]); err != nil {
+		fmt.Fprintln(os.Stderr, "error:", err)
+		os.Exit(1)
+	}
+}
+
+func run(args []string) error {
+	global := flag.NewFlagSet("007pay", flag.ContinueOnError)
+	global.SetOutput(os.Stderr)
+	cfg := globalConfig{}
+	global.StringVar(&cfg.BaseURL, "base-url", envAny("PAY007_BASE_URL", "007PAY_BASE_URL"), "007Pay service base URL")
+	global.StringVar(&cfg.PID, "pid", envAny("PAY007_PID", "007PAY_PID"), "merchant app pid/token")
+	global.StringVar(&cfg.Key, "key", envAny("PAY007_KEY", "007PAY_KEY"), "merchant app secret key")
+	global.DurationVar(&cfg.Timeout, "timeout", 15*time.Second, "HTTP request timeout")
+	global.Usage = usage
+
+	if err := global.Parse(args); errors.Is(err, flag.ErrHelp) {
+		return nil
+	} else if err != nil {
+		return err
+	}
+	rest := global.Args()
+	if len(rest) == 0 {
+		usage()
+		return errors.New("missing command")
+	}
+
+	cmd, cmdArgs := rest[0], rest[1:]
+	switch cmd {
+	case "submit":
+		return submit(cfg, cmdArgs)
+	case "query":
+		return query(cfg, cmdArgs)
+	case "refund":
+		return refund(cfg, cmdArgs)
+	case "orders":
+		return orders(cfg, cmdArgs)
+	case "manual":
+		return manual(cfg, cmdArgs)
+	case "stats":
+		return stats(cfg, cmdArgs)
+	case "sign":
+		return signParams(cfg, cmdArgs)
+	case "verify":
+		return verifyParams(cfg, cmdArgs)
+	case "help", "-h", "--help":
+		usage()
+		return nil
+	default:
+		usage()
+		return fmt.Errorf("unknown command %q", cmd)
+	}
+}
+
+func newClient(cfg globalConfig) (*pay007.Client, error) {
+	return pay007.NewClient(cfg.BaseURL, cfg.PID, cfg.Key, pay007.WithTimeout(cfg.Timeout))
+}
+
+func submit(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("submit", flag.ContinueOnError)
+	req := pay007.SubmitRequest{}
+	fs.StringVar(&req.OutTradeNo, "out-trade-no", "", "merchant order number")
+	fs.StringVar(&req.Name, "name", "", "order subject")
+	fs.StringVar(&req.Money, "money", "", "amount in yuan, for example 9.90")
+	fs.StringVar(&req.Type, "type", "", "channel code, for example alipay or wechat")
+	fs.StringVar(&req.ClientType, "clienttype", "", "client type: pc or mobile")
+	fs.StringVar(&req.NotifyURL, "notify-url", "", "merchant async notify URL")
+	fs.StringVar(&req.ReturnURL, "return-url", "", "merchant sync return URL")
+	fs.StringVar(&req.Body, "body", "", "order description")
+	fs.StringVar(&req.Attach, "attach", "", "extra data")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Submit(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func query(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("query", flag.ContinueOnError)
+	req := pay007.QueryRequest{}
+	fs.StringVar(&req.TradeNo, "trade-no", "", "007Pay order number")
+	fs.StringVar(&req.OutTradeNo, "out-trade-no", "", "merchant order number")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Query(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func refund(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("refund", flag.ContinueOnError)
+	req := pay007.RefundRequest{}
+	fs.StringVar(&req.TradeNo, "trade-no", "", "007Pay order number")
+	fs.StringVar(&req.OutTradeNo, "out-trade-no", "", "merchant order number")
+	fs.StringVar(&req.Money, "money", "", "refund amount in yuan; omit to refund full order")
+	fs.StringVar(&req.Reason, "reason", "", "refund reason")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Refund(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func orders(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("orders", flag.ContinueOnError)
+	req := pay007.OrdersRequest{}
+	status := fs.Int("status", -1, "order status: 0 pending, 1 paid, 2 closed, 3 refunded")
+	fs.StringVar(&req.OrderNo, "order-no", "", "007Pay or merchant order number")
+	fs.IntVar(&req.Page, "page", 1, "page number")
+	fs.IntVar(&req.PageSize, "page-size", 20, "page size")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+	if *status >= 0 {
+		req.Status = status
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Orders(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func manual(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("manual", flag.ContinueOnError)
+	req := pay007.ManualRequest{}
+	fs.StringVar(&req.OutTradeNo, "out-trade-no", "", "merchant order number")
+	fs.StringVar(&req.Name, "name", "", "order subject")
+	fs.StringVar(&req.Money, "money", "", "amount in yuan")
+	fs.StringVar(&req.Type, "type", "", "channel code")
+	fs.StringVar(&req.Attach, "attach", "", "extra data")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Manual(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func stats(cfg globalConfig, args []string) error {
+	fs := flag.NewFlagSet("stats", flag.ContinueOnError)
+	req := pay007.StatsRequest{}
+	fs.StringVar(&req.Begin, "begin", "", "begin time: 2006-01-02 15:04:05")
+	fs.StringVar(&req.End, "end", "", "end time: 2006-01-02 15:04:05")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	client, err := newClient(cfg)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Stats(context.Background(), req)
+	if err != nil {
+		return err
+	}
+	return printJSON(resp)
+}
+
+func signParams(cfg globalConfig, args []string) error {
+	if strings.TrimSpace(cfg.Key) == "" {
+		return errors.New("--key or PAY007_KEY is required")
+	}
+	params, err := parseKV(args)
+	if err != nil {
+		return err
+	}
+	if cfg.PID != "" {
+		params["pid"] = cfg.PID
+	}
+	params["sign_type"] = "MD5"
+	params["sign"] = pay007.BuildSign(params, cfg.Key)
+	return printJSON(params)
+}
+
+func verifyParams(cfg globalConfig, args []string) error {
+	if strings.TrimSpace(cfg.Key) == "" {
+		return errors.New("--key or PAY007_KEY is required")
+	}
+	params, err := parseKV(args)
+	if err != nil {
+		return err
+	}
+	return printJSON(map[string]any{
+		"ok":   pay007.VerifySign(params, cfg.Key),
+		"sign": pay007.BuildSign(params, cfg.Key),
+	})
+}
+
+func parseKV(args []string) (map[string]string, error) {
+	params := map[string]string{}
+	for _, arg := range args {
+		k, v, ok := strings.Cut(arg, "=")
+		if !ok || strings.TrimSpace(k) == "" {
+			return nil, fmt.Errorf("invalid param %q, expected key=value", arg)
+		}
+		params[k] = v
+	}
+	return params, nil
+}
+
+func printJSON(v any) error {
+	data, err := json.MarshalIndent(v, "", "  ")
+	if err != nil {
+		return err
+	}
+	fmt.Println(string(data))
+	return nil
+}
+
+func envAny(keys ...string) string {
+	for _, key := range keys {
+		if v := strings.TrimSpace(os.Getenv(key)); v != "" {
+			return v
+		}
+	}
+	return ""
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, `007Pay merchant SDK CLI
+
+Global flags:
+  --base-url   007Pay service base URL, or PAY007_BASE_URL
+  --pid        merchant app pid/token, or PAY007_PID
+  --key        merchant app secret key, or PAY007_KEY
+  --timeout    HTTP timeout, default 15s
+
+Commands:
+  submit   create a payment order
+  query    query and channel-check an order
+  refund   refund an order
+  orders   list merchant orders
+  manual   create a manual paid order
+  stats    query merchant stats
+  sign     sign key=value params
+  verify   verify key=value params with sign=...
+
+Examples:
+  007pay --base-url http://127.0.0.1:8081 --pid app-token --key secret submit --out-trade-no T1001 --name test --money 0.01 --type alipay
+  007pay query --out-trade-no T1001
+  007pay sign out_trade_no=T1001 name=test money=0.01 type=alipay
+`)
+}
diff --git a/examples/create_order/main.go b/examples/create_order/main.go
new file mode 100644
index 0000000..299009e
--- /dev/null
+++ b/examples/create_order/main.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	pay007 "gitea.s1f.ren/shiran/007pay-sdk.git"
+)
+
+func main() {
+	client, err := pay007.NewClient(
+		os.Getenv("PAY007_BASE_URL"),
+		os.Getenv("PAY007_PID"),
+		os.Getenv("PAY007_KEY"),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	resp, err := client.Submit(context.Background(), pay007.SubmitRequest{
+		OutTradeNo: "demo-" + time.Now().Format("20060102150405"),
+		Name:       "SDK demo order",
+		Money:      "0.01",
+		Type:       "alipay",
+		ClientType: "pc",
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	data, _ := json.MarshalIndent(resp, "", "  ")
+	fmt.Println(string(data))
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..eab24a5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gitea.s1f.ren/shiran/007pay-sdk.git
+
+go 1.20
diff --git a/sign.go b/sign.go
new file mode 100644
index 0000000..ecfcf47
--- /dev/null
+++ b/sign.go
@@ -0,0 +1,55 @@
+package pay007
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"sort"
+	"strings"
+)
+
+var ignoredSignKeys = map[string]struct{}{
+	"sign":      {},
+	"sign_type": {},
+}
+
+// BuildSign creates the 007Pay merchant MD5 signature.
+//
+// Empty values, sign, and sign_type are ignored. The remaining params are
+// sorted by key, joined as "a=1&b=2", appended with the app secret, then MD5
+// hashed and upper-cased.
+func BuildSign(params map[string]string, secret string) string {
+	keys := make([]string, 0, len(params))
+	for k, v := range params {
+		if v == "" {
+			continue
+		}
+		if _, ok := ignoredSignKeys[k]; ok {
+			continue
+		}
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	var b strings.Builder
+	for i, k := range keys {
+		if i > 0 {
+			b.WriteByte('&')
+		}
+		b.WriteString(k)
+		b.WriteByte('=')
+		b.WriteString(params[k])
+	}
+	b.WriteString(secret)
+
+	sum := md5.Sum([]byte(b.String()))
+	return strings.ToUpper(hex.EncodeToString(sum[:]))
+}
+
+// VerifySign checks params["sign"] with the 007Pay signing rule.
+func VerifySign(params map[string]string, secret string) bool {
+	sign := params["sign"]
+	if sign == "" {
+		return false
+	}
+	return strings.EqualFold(BuildSign(params, secret), sign)
+}
diff --git a/sign_test.go b/sign_test.go
new file mode 100644
index 0000000..c248b7b
--- /dev/null
+++ b/sign_test.go
@@ -0,0 +1,37 @@
+package pay007
+
+import "testing"
+
+func TestBuildSign(t *testing.T) {
+	params := map[string]string{
+		"pid":          "1001",
+		"out_trade_no": "A100",
+		"name":         "test",
+		"money":        "1.00",
+		"type":         "alipay",
+		"empty":        "",
+		"sign_type":    "MD5",
+		"sign":         "ignored",
+	}
+
+	got := BuildSign(params, "secret")
+	const want = "59DD6586A5050050EB08A9806C6F501B"
+	if got != want {
+		t.Fatalf("BuildSign() = %s, want %s", got, want)
+	}
+}
+
+func TestVerifySign(t *testing.T) {
+	params := map[string]string{
+		"pid":          "1001",
+		"out_trade_no": "A100",
+		"name":         "test",
+		"money":        "1.00",
+		"type":         "alipay",
+	}
+	params["sign"] = BuildSign(params, "secret")
+
+	if !VerifySign(params, "secret") {
+		t.Fatal("VerifySign() = false, want true")
+	}
+}
diff --git a/types.go b/types.go
new file mode 100644
index 0000000..21731de
--- /dev/null
+++ b/types.go
@@ -0,0 +1,175 @@
+package pay007
+
+import "time"
+
+const (
+	StatusPending = 0
+	StatusPaid    = 1
+	StatusClosed  = 2
+	StatusRefund  = 3
+)
+
+// SubmitRequest creates a platform order and returns a cashier URL.
+type SubmitRequest struct {
+	OutTradeNo string
+	Name       string
+	Money      string
+	Type       string
+	ClientType string
+	NotifyURL  string
+	ReturnURL  string
+	Body       string
+	Attach     string
+}
+
+func (r SubmitRequest) params() map[string]string {
+	return compactParams(map[string]string{
+		"out_trade_no": r.OutTradeNo,
+		"name":         r.Name,
+		"money":        r.Money,
+		"type":         r.Type,
+		"clienttype":   r.ClientType,
+		"notify_url":   r.NotifyURL,
+		"return_url":   r.ReturnURL,
+		"body":         r.Body,
+		"attach":       r.Attach,
+	})
+}
+
+type SubmitResponse struct {
+	OrderNo    string `json:"order_no"`
+	OutTradeNo string `json:"out_trade_no"`
+	Amount     int64  `json:"amount"`
+	CashierURL string `json:"cashier_url"`
+}
+
+type QueryRequest struct {
+	TradeNo    string
+	OutTradeNo string
+}
+
+func (r QueryRequest) params() map[string]string {
+	return compactParams(map[string]string{
+		"trade_no":     r.TradeNo,
+		"out_trade_no": r.OutTradeNo,
+	})
+}
+
+type QueryResponse struct {
+	TradeNo        string     `json:"trade_no"`
+	OutTradeNo     string     `json:"out_trade_no"`
+	ChannelTradeNo string     `json:"channel_trade_no"`
+	Amount         int64      `json:"amount"`
+	Status         int        `json:"status"`
+	Completed      bool       `json:"completed"`
+	ChannelChecked bool       `json:"channel_checked"`
+	PaidAt         *time.Time `json:"paid_at"`
+}
+
+type RefundRequest struct {
+	TradeNo    string
+	OutTradeNo string
+	Money      string
+	Reason     string
+}
+
+func (r RefundRequest) params() map[string]string {
+	return compactParams(map[string]string{
+		"trade_no":     r.TradeNo,
+		"out_trade_no": r.OutTradeNo,
+		"money":        r.Money,
+		"reason":       r.Reason,
+	})
+}
+
+type RefundResponse struct {
+	RefundNo string `json:"refund_no"`
+	Status   int    `json:"status"`
+}
+
+type OrdersRequest struct {
+	OrderNo  string
+	Status   *int
+	Page     int
+	PageSize int
+}
+
+func (r OrdersRequest) params() map[string]string {
+	params := compactParams(map[string]string{
+		"order_no": r.OrderNo,
+	})
+	if r.Status != nil {
+		params["status"] = itoa(*r.Status)
+	}
+	if r.Page > 0 {
+		params["page"] = itoa(r.Page)
+	}
+	if r.PageSize > 0 {
+		params["page_size"] = itoa(r.PageSize)
+	}
+	return params
+}
+
+type OrdersResponse struct {
+	Total int64   `json:"total"`
+	List  []Order `json:"list"`
+}
+
+type Order struct {
+	TradeNo        string     `json:"trade_no"`
+	OutTradeNo     string     `json:"out_trade_no"`
+	Subject        string     `json:"subject"`
+	Amount         int64      `json:"amount"`
+	Fee            int64      `json:"fee"`
+	Status         int        `json:"status"`
+	ChannelID      uint       `json:"channel_id"`
+	ChannelTradeNo string     `json:"channel_trade_no"`
+	ClientType     string     `json:"client_type"`
+	IsManual       bool       `json:"is_manual"`
+	PaidAt         *time.Time `json:"paid_at"`
+	CreatedAt      *time.Time `json:"created_at"`
+}
+
+type ManualRequest struct {
+	OutTradeNo string
+	Name       string
+	Money      string
+	Type       string
+	Attach     string
+}
+
+func (r ManualRequest) params() map[string]string {
+	return compactParams(map[string]string{
+		"out_trade_no": r.OutTradeNo,
+		"name":         r.Name,
+		"money":        r.Money,
+		"type":         r.Type,
+		"attach":       r.Attach,
+	})
+}
+
+type ManualResponse struct {
+	TradeNo    string `json:"trade_no"`
+	OutTradeNo string `json:"out_trade_no"`
+	Amount     int64  `json:"amount"`
+	Status     int    `json:"status"`
+}
+
+type StatsRequest struct {
+	Begin string
+	End   string
+}
+
+func (r StatsRequest) params() map[string]string {
+	return compactParams(map[string]string{
+		"begin": r.Begin,
+		"end":   r.End,
+	})
+}
+
+type StatsResponse struct {
+	OrderCount  int64 `json:"order_count"`
+	TotalAmount int64 `json:"total_amount"`
+	TotalFee    int64 `json:"total_fee"`
+	NetAmount   int64 `json:"net_amount"`
+}