Language：GO  
GO version：1.22.5+  
Tags：v1.2.42
Copyright：Ant financial services group  

1 Please use the latest version

https://mvnrepository.com/artifact/com.alipay.global.sdk/global-open-sdk-go

 go get github.com/alipay/global-open-sdk-go

2 The demo code for create payment

       payRequest, request := pay.NewAlipayPayRequest()

    request.PaymentRequestId = "ad716a-81-4c4c-b51-20916c5225e"
    order := &model.Order{}
    order.OrderDescription = "example order"
    order.ReferenceOrderId = "28947397358748"
    order.OrderAmount = model.NewAmount("100", "HKD")
    merchant := &model.Merchant{}
    merchant.ReferenceMerchantId = "1238rye8yr8erwer"
    merchant.MerchantMCC = "7011"
    merchant.MerchantName = "example merchant"
    merchant.Store = &model.Store{StoreMCC: "7011", ReferenceStoreId: "289285674", StoreName: "store 1111"}
    order.Merchant = merchant
    order.Env = &model.Env{OsType: model.ANDROID, TerminalType: model.WEB}
    request.Order = order

    request.PaymentAmount = model.NewAmount("100", "HKD")

    request.PaymentNotifyUrl = "https://www.yourNotifyUrl.com"
    request.PaymentRedirectUrl = "https://www.yourRedirectUrl.com"

    request.PaymentMethod = &model.PaymentMethod{PaymentMethodType: model.ALIPAY_HK, PaymentMethodId: "1234567890"}

    request.ProductCode = model.CASHIER_PAYMENT

    execute, err := client.Execute(payRequest)
    if err != nil {
        print(err.Error())
        return
    }
    response := execute.(*responsePay.AlipayPayResponse)

The execute method contains the HTTP request to the gateway.

type DefaultAlipayClient struct {
    GatewayUrl         string
    ClientId           string
    MerchantPrivateKey string
    AlipayPublicKey    string
    IsSandboxMode      bool
}

func NewDefaultAlipayClient(gatewayUrl string, clientId string, merchantPrivateKey string, alipayPublicKey string) *DefaultAlipayClient {
    isSandboxMode := false
    if strings.HasPrefix(clientId, "SANDBOX_") {
        isSandboxMode = true
    }

    return &DefaultAlipayClient{
        GatewayUrl:         gatewayUrl,
        ClientId:           clientId,
        MerchantPrivateKey: merchantPrivateKey,
        AlipayPublicKey:    alipayPublicKey,
        IsSandboxMode:      isSandboxMode,
    }
}

func (alipayClient *DefaultAlipayClient) Execute(alipayRequest *request.AlipayRequest) (any, error) {
    reqPayload, err := json.Marshal(alipayRequest.Param)
    if err != nil {
        return nil, &exception.AlipaySDKError{Message: "json.Marshal is fail " + err.Error()}
    }
    path := alipayRequest.Path
    httpMethod := alipayRequest.HttpMethod
    reqTime := strconv.FormatInt(time.Now().UnixNano(), 10)
    sign, err := genSign(fmt.Sprintf("%s", httpMethod), path, alipayClient.ClientId, reqTime, string(reqPayload), getPkcsKeu(alipayClient.MerchantPrivateKey))
    if err != nil {
        return nil, err
    }
    header := buildBaseHeader(reqTime, alipayClient.ClientId, alipayRequest.KeyVersion, sign)
    alipayResponse, err := alipayClient.httpDo(alipayClient.GatewayUrl+path, httpMethod, map[string]string{}, header, reqPayload, alipayRequest.AlipayResponse)
    if err != nil {
        return nil, err
    }
    return alipayResponse, nil
}