Refund Order

package main

import (
    "bytes"
    "crypto/hmac"
    "crypto/sha256"
    "encoding/hex"
    "encoding/json"
    "fmt"
    "io"
    "net/http"
    "strconv"
    "time"
    "github.com/google/uuid"
)

type RefundRequest struct {
    OrderID      int64   `json:"orderId"`
    RefundAmount float64 `json:"refundAmount"`
}

type RefundResponse struct {
    AccountName     string  `json:"accountName"`
    AccountNumber   string  `json:"accountNumber"`
    Amount          float64 `json:"amount"`
    Currency        string  `json:"currency"`
    OrderID         int64   `json:"orderId"`
    Remark          string  `json:"remark"`
    TransactionDate string  `json:"transactionDate"`
    TransactionID   int64   `json:"transactionId"`
}

func generateSignature(secret, timestamp, rawPayload string) string {
    // Create message: rawPayload + timestamp
    message := rawPayload + timestamp

    // Create HMAC with SHA256
    h := hmac.New(sha256.New, []byte(secret))
    h.Write([]byte(message))

    // Return hex digest
    return hex.EncodeToString(h.Sum(nil))
}

func refundOrder(orderID int64, amount float64, apiKey, apiSecret string) (*RefundResponse, error) {
    url := "https://merchant.dv.vai247.pro/api/v1/payment-gateway/order/refund"

    payload := RefundRequest{
        OrderID:      orderID,
        RefundAmount: amount,
    }

    jsonData, err := json.Marshal(payload)
    if err != nil {
        return nil, err
    }
    rawPayload := string(jsonData)

    // Generate timestamp
    timestamp := strconv.FormatInt(time.Now().Unix(), 10)

    // Generate signature
    signature := generateSignature(apiSecret, timestamp, rawPayload)

    // Generate idempotent key
    idempotentKey := uuid.New().String()

    req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    if err != nil {
        return nil, err
    }

    // Add authentication headers
    req.Header.Set("X-Api-Key", apiKey)
    req.Header.Set("X-Timestamp", timestamp)
    req.Header.Set("X-Signature", signature)
    req.Header.Set("X-Idempotent-Key", idempotentKey)
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    body, err := io.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }

    var result RefundResponse
    if err := json.Unmarshal(body, &result); err != nil {
        return nil, err
    }

    return &result, nil
}

func main() {
    refund, err := refundOrder(1234567890, 5.25, "your-api-key", "your-api-secret")
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        return
    }

    fmt.Printf("Transaction ID: %d\n", refund.TransactionID)
    fmt.Printf("Order ID: %d\n", refund.OrderID)
    fmt.Printf("Amount: %.2f %s\n", refund.Amount, refund.Currency)
}

const axios = require('axios');
const crypto = require('crypto');
const { v4: uuidv4 } = require('uuid');

function generateSignature(secret, timestamp, rawPayload) {
    // Create HMAC with SHA256
    const hmac = crypto.createHmac('sha256', secret);

    // Create message: rawPayload + timestamp
    const message = rawPayload + timestamp.toString();

    // Update HMAC with message and get hex digest
    hmac.update(message);
    return hmac.digest('hex');
}

async function refundOrder(orderId, amount, apiKey, apiSecret) {
    const url = 'https://merchant.dv.vai247.pro/api/v1/payment-gateway/order/refund';

    // Create payload
    const payload = {
        orderId: orderId,
        refundAmount: amount
    };
    const rawPayload = JSON.stringify(payload);

    // Generate timestamp
    const timestamp = Math.floor(Date.now() / 1000);

    // Generate signature
    const signature = generateSignature(apiSecret, timestamp, rawPayload);

    // Generate idempotent key
    const idempotentKey = uuidv4();

    // Make request
    const headers = {
        'X-Api-Key': apiKey,
        'X-Timestamp': timestamp.toString(),
        'X-Signature': signature,
        'X-Idempotent-Key': idempotentKey,
        'Content-Type': 'application/json'
    };

    try {
        const response = await axios.post(url, payload, { headers });
        return response.data;
    } catch (error) {
        console.error('Error processing refund:', error.response?.data || error.message);
        throw error;
    }
}

// Usage
(async () => {
    try {
        const refund = await refundOrder(1234567890, 5.25, 'your-api-key', 'your-api-secret');
        console.log('Transaction ID:', refund.data.transactionId);
        console.log('Order ID:', refund.data.orderId);
        console.log('Amount:', `${refund.data.amount} ${refund.data.currency}`);
    } catch (error) {
        console.error('Failed to process refund');
    }
})();