Generate paystack webhook signature using golang for testing purposes

main.go

 package main

 import (
 	"crypto/hmac"
 	"crypto/sha512"
 	"encoding/hex"
 	"fmt"
 )

 func createSignature(payload []byte, secretKey string) string {
 	mac := hmac.New(sha512.New, []byte(secretKey))
 	mac.Write(payload)
 	return hex.EncodeToString(mac.Sum(nil))
}

 func main() {
	jsonString := `{
  "event": "charge.success",
  "data": {
    "id": 302961,
    "domain": "live",
    "status": "success",
    "reference": "018d0d84-b061-77ba-8610-365e16f2e10f--018d0d84-b066-75aa-b2c9-6f37bf4bb7f1",
    "amount": 10000,
    "message": null,
    "gateway_response": "Approved by Financial Institution",
    "paid_at": "2016-09-30T21:10:19.000Z",
    "created_at": "2016-09-30T21:09:56.000Z",
    "channel": "card",
    "currency": "NGN",
    "ip_address": "41.242.49.37",
    "metadata": 0,
    "log": {
      "time_spent": 16,
      "attempts": 1,
      "authentication": "pin",
      "errors": 0,
      "success": false,
      "mobile": false,
      "input": [],
      "channel": null,
      "history": [
        {
          "type": "input",
          "message": "Filled these fields: card number, card expiry, card cvv",
          "time": 15
        },
        {
          "type": "action",
          "message": "Attempted to pay",
          "time": 15
        },
        {
          "type": "auth",
          "message": "Authentication Required: pin",
          "time": 16
        }
      ]
    },
    "fees": null,
    "customer": {
      "id": 68324,
      "first_name": "BoJack",
      "last_name": "Horseman",
      "email": "[email protected]",
      "customer_code": "CUS_qo38as2hpsgk2r0",
      "phone": null,
      "metadata": null,
      "risk_action": "default"
    },
    "authorization": {
      "authorization_code": "AUTH_f5rnfq9p",
      "bin": "539999",
      "last4": "8877",
      "exp_month": "08",
      "exp_year": "2020",
      "card_type": "mastercard DEBIT",
      "bank": "Guaranty Trust Bank",
      "country_code": "NG",
      "brand": "mastercard",
      "account_name": "BoJack Horseman"
    },
    "plan": {}
  }
}`

	// Convert JSON string to []byte
	jsonBytes := []byte(jsonString)

	// Corrected: Call createSignature with jsonBytes
	signature := createSignature(jsonBytes, "sk_test_")

	// Print the generated signature
	fmt.Println("Generated Signature:", signature)
}