diff --git a/backend/app/http/orders.go b/backend/app/http/orders.go
new file mode 100644
index 0000000..d02cfda
--- /dev/null
+++ b/backend/app/http/orders.go
@@ -0,0 +1 @@
+package http
diff --git a/backend/app/http/posts.go b/backend/app/http/posts.go
index 1ec3e94..fb34b15 100644
--- a/backend/app/http/posts.go
+++ b/backend/app/http/posts.go
@@ -1,12 +1,16 @@
 package http
 
 import (
+	"time"
+
 	"quyun/app/models"
 	"quyun/app/requests"
 	"quyun/database/schemas/public/model"
+	"quyun/providers/wepay"
 
 	"github.com/gofiber/fiber/v3"
 	"github.com/gofiber/fiber/v3/log"
+	"github.com/pkg/errors"
 )
 
 type ListQuery struct {
@@ -14,7 +18,9 @@ type ListQuery struct {
 }
 
 // @provider
-type posts struct{}
+type posts struct {
+	wepay *wepay.Client
+}
 
 // List posts
 // @Router			/posts [get]
@@ -40,3 +46,40 @@ func (ctl *posts) Mine(ctx fiber.Ctx, pagination *requests.Pagination, query *Li
 	log.Infof("Fetching posts for user with pagination: %+v and keyword: %v", pagination, query.Keyword)
 	return models.Users.PostList(ctx.Context(), 1, pagination, query.Keyword)
 }
+
+// Buy
+// @Router			/buy/:id [get]
+// @Bind id path
+func (ctl *posts) Buy(ctx fiber.Ctx, id int64) (*string, error) {
+	var userId int64 = 1
+
+	user, err := models.Users.GetByID(ctx.Context(), userId)
+	if err != nil {
+		return nil, errors.Wrapf(err, " failed to get user: %d", userId)
+	}
+
+	post, err := models.Posts.GetByID(ctx.Context(), id)
+	if err != nil {
+		return nil, errors.Wrapf(err, " failed to get post: %d", id)
+	}
+
+	// create order
+	order, err := models.Orders.Create(ctx.Context(), userId, post.ID)
+	if err != nil {
+		return nil, errors.Wrap(err, "订单创建失败")
+	}
+
+	body := ctl.wepay.
+		BodyMap().
+		Expire(30 * time.Minute).
+		Description(post.Title).
+		OutTradeNo(order.OrderNo).
+		Payer(user.OpenID)
+
+	prePayResp, err := ctl.wepay.V3TransactionJsapi(ctx.Context(), body)
+	if err != nil {
+		log.Errorf("wepay.V3TransactionJsapi err: %v", err)
+		return nil, errors.Wrap(err, "微信支付失败")
+	}
+	return &prePayResp.Response.PrepayId, nil
+}
diff --git a/backend/app/service/http/http.go b/backend/app/service/http/http.go
index 80b402f..246cdef 100644
--- a/backend/app/service/http/http.go
+++ b/backend/app/service/http/http.go
@@ -17,6 +17,7 @@ import (
 	"quyun/providers/job"
 	"quyun/providers/jwt"
 	"quyun/providers/postgres"
+	"quyun/providers/wepay"
 
 	"go.ipao.vip/atom"
 	"go.ipao.vip/atom/container"
@@ -31,6 +32,7 @@ import (
 func defaultProviders() container.Providers {
 	return service.Default(container.Providers{
 		ali.DefaultProvider(),
+		wepay.DefaultProvider(),
 		http.DefaultProvider(),
 		postgres.DefaultProvider(),
 		jwt.DefaultProvider(),
diff --git a/backend/go.mod b/backend/go.mod
index 2cdae7b..b329388 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -11,6 +11,7 @@ require (
 	github.com/ThreeDotsLabs/watermill-sql/v3 v3.1.0
 	github.com/aliyun/credentials-go v1.4.5
 	github.com/go-jet/jet/v2 v2.13.0
+	github.com/go-pay/gopay v1.5.110
 	github.com/gofiber/fiber/v3 v3.0.0-beta.4
 	github.com/gofiber/utils/v2 v2.0.0-beta.7
 	github.com/golang-jwt/jwt/v4 v4.5.1
@@ -82,6 +83,12 @@ require (
 	github.com/go-openapi/jsonreference v0.21.0 // indirect
 	github.com/go-openapi/spec v0.21.0 // indirect
 	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/go-pay/crypto v0.0.1 // indirect
+	github.com/go-pay/errgroup v0.0.3 // indirect
+	github.com/go-pay/smap v0.0.2 // indirect
+	github.com/go-pay/util v0.0.4 // indirect
+	github.com/go-pay/xlog v0.0.3 // indirect
+	github.com/go-pay/xtime v0.0.2 // indirect
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
 	github.com/gofiber/schema v1.2.0 // indirect
diff --git a/backend/go.sum b/backend/go.sum
index 24d1815..020f7da 100644
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -82,6 +82,20 @@ github.com/go-openapi/spec v0.21.0 h1:LTVzPc3p/RzRnkQqLRndbAzjY0d0BCL72A6j3CdL9Z
 github.com/go-openapi/spec v0.21.0/go.mod h1:78u6VdPw81XU44qEWGhtr982gJ5BWg2c0I5XwVMotYk=
 github.com/go-openapi/swag v0.23.0 h1:vsEVJDUo2hPJ2tu0/Xc+4noaxyEffXNIs3cOULZ+GrE=
 github.com/go-openapi/swag v0.23.0/go.mod h1:esZ8ITTYEsH1V2trKHjAN8Ai7xHb8RV+YSZ577vPjgQ=
+github.com/go-pay/crypto v0.0.1 h1:B6InT8CLfSLc6nGRVx9VMJRBBazFMjr293+jl0lLXUY=
+github.com/go-pay/crypto v0.0.1/go.mod h1:41oEIvHMKbNcYlWUlRWtsnC6+ASgh7u29z0gJXe5bes=
+github.com/go-pay/errgroup v0.0.3 h1:DB4s8e8oWYDyETKQ1y1riMJ7y29zE1uIsMCSjEOFSbU=
+github.com/go-pay/errgroup v0.0.3/go.mod h1:0+4b8mvFMS71MIzsaC+gVvB4x37I93lRb2dqrwuU8x8=
+github.com/go-pay/gopay v1.5.110 h1:K+S1goJu5235Bi94uxD0VIQXCOiC7taw5QkCBc2J7PE=
+github.com/go-pay/gopay v1.5.110/go.mod h1:v2VLAEV2NI6SIRS3Qpyi826pBwlWthHvP/ZVVTjqxwU=
+github.com/go-pay/smap v0.0.2 h1:kKflYor5T5FgZltPFBMTFfjJvqYMHr5VnIFSEyhVTcA=
+github.com/go-pay/smap v0.0.2/go.mod h1:HW9oAo0okuyDYsbpbj5fJFxnNj/BZorRGFw26SxrNWw=
+github.com/go-pay/util v0.0.4 h1:TuwSU9o3Qd7m9v1PbzFuIA/8uO9FJnA6P7neG/NwPyk=
+github.com/go-pay/util v0.0.4/go.mod h1:Tsdhs8Ib9J9b4+NKNO1PHh5hWHhlg98PthsX0ckq6PM=
+github.com/go-pay/xlog v0.0.3 h1:avyMhCL/JgBHreoGx/am/kHxfs1udDOAeVqbmzP/Yes=
+github.com/go-pay/xlog v0.0.3/go.mod h1:mH47xbobrdsSHWsmFtSF5agWbMHFP+tK0ZbVCk5OAEw=
+github.com/go-pay/xtime v0.0.2 h1:7YR4/iuELsEHpJ6LUO0SVK80hQxDO9MLCfuVYIiTCRM=
+github.com/go-pay/xtime v0.0.2/go.mod h1:W1yRbJaSt4CSBcdAtLBQ8xajiN/Pl5hquGczUcUE9xE=
 github.com/go-sql-driver/mysql v1.9.0 h1:Y0zIbQXhQKmQgTp44Y1dp3wTXcn804QoTptLZT1vtvo=
 github.com/go-sql-driver/mysql v1.9.0/go.mod h1:pDetrLJeA3oMujJuvXc8RJoasr589B6A9fwzD3QMrqw=
 github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
diff --git a/backend/providers/wepay/config.go b/backend/providers/wepay/config.go
new file mode 100644
index 0000000..8a300a6
--- /dev/null
+++ b/backend/providers/wepay/config.go
@@ -0,0 +1,28 @@
+package wepay
+
+import (
+	"go.ipao.vip/atom/container"
+	"go.ipao.vip/atom/opt"
+)
+
+const DefaultPrefix = "WePay"
+
+func DefaultProvider() container.ProviderContainer {
+	return container.ProviderContainer{
+		Provider: Provide,
+		Options: []opt.Option{
+			opt.Prefix(DefaultPrefix),
+		},
+	}
+}
+
+type Config struct {
+	Debug     bool
+	NotifyURL string
+
+	AppId      string
+	MchId      string
+	SerialNo   string
+	APIv3Key   string
+	PrivateKey string
+}
diff --git a/backend/providers/wepay/pay.go b/backend/providers/wepay/pay.go
new file mode 100644
index 0000000..cfb2462
--- /dev/null
+++ b/backend/providers/wepay/pay.go
@@ -0,0 +1,127 @@
+package wepay
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/go-pay/gopay"
+	"github.com/go-pay/gopay/wechat/v3"
+	"go.ipao.vip/atom/container"
+	"go.ipao.vip/atom/opt"
+)
+
+func Provide(opts ...opt.Option) error {
+	o := opt.New(opts...)
+	var config Config
+	if err := o.UnmarshalConfig(&config); err != nil {
+		return err
+	}
+	return container.Container.Provide(func() (*Client, error) {
+		// NewClientV3 初始化微信客户端 v3
+		// mchid：商户ID 或者服务商模式的 sp_mchid
+		// serialNo：商户证书的证书序列号
+		// apiV3Key：apiV3Key，商户平台获取
+		// privateKey：私钥 apiclient_key.pem 读取后的内容
+		client, err := wechat.NewClientV3(config.MchId, config.SerialNo, config.APIv3Key, config.PrivateKey)
+		if err != nil {
+			return nil, err
+		}
+
+		client.DebugSwitch = gopay.DebugOff
+		if config.Debug {
+			client.DebugSwitch = gopay.DebugOn
+		}
+
+		return &Client{
+			payClient: client,
+			config:    &config,
+		}, nil
+	}, o.DiOptions()...)
+}
+
+type Client struct {
+	payClient *wechat.ClientV3
+	config    *Config
+}
+
+func (c *Client) GetClient() *wechat.ClientV3 {
+	return c.payClient
+}
+
+func (c *Client) V3TransactionJsapi(ctx context.Context, bm *BodyMap) (*wechat.PrepayRsp, error) {
+	resp, err := c.payClient.V3TransactionJsapi(ctx, bm.bm)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.Code != wechat.Success {
+		return nil, errors.New(resp.Error)
+	}
+
+	return resp, nil
+}
+
+func (c *Client) BodyMap() *BodyMap { return NewBodyMap(c.config) }
+
+type BodyMap struct {
+	bm gopay.BodyMap
+}
+
+func NewBodyMap(c *Config) *BodyMap {
+	bm := make(gopay.BodyMap)
+	bm.Set("sp_appid", c.AppId).
+		Set("sp_mchid", c.MchId).
+		Set("notify_url", c.NotifyURL).
+		Set("amount", func(bm gopay.BodyMap) {
+			bm.Set("total", 1).
+				Set("currency", "CNY")
+		})
+	return &BodyMap{
+		bm: bm,
+	}
+}
+
+func (b *BodyMap) Set(key string, value interface{}) *BodyMap {
+	b.bm.Set(key, value)
+	return b
+}
+
+func (b *BodyMap) SetBodyMap(key string, f func(bm gopay.BodyMap)) *BodyMap {
+	b.bm.SetBodyMap(key, f)
+	return b
+}
+
+// Expire time
+func (b *BodyMap) Expire(t time.Duration) *BodyMap {
+	return b.Set("time_expire", time.Now().Add(t).Format(time.RFC3339))
+}
+
+// Description
+func (b *BodyMap) Description(desc string) *BodyMap {
+	return b.Set("description", desc)
+}
+
+// OutTradeNo
+func (b *BodyMap) OutTradeNo(outTradeNo string) *BodyMap {
+	return b.Set("out_trade_no", outTradeNo)
+}
+
+// Amount
+func (b *BodyMap) Amount(total int, currency string) *BodyMap {
+	return b.SetBodyMap("amount", func(bm gopay.BodyMap) {
+		bm.Set("total", total).Set("currency", currency)
+	})
+}
+
+// Payer
+func (b *BodyMap) Payer(spOpenId string) *BodyMap {
+	return b.SetBodyMap("payer", func(bm gopay.BodyMap) {
+		bm.Set("sp_openid", spOpenId)
+	})
+}
+
+// SubMchId
+func (b *BodyMap) SubMchId(subMchId string) *BodyMap {
+	return b.Set("sub_mchid", subMchId)
+}