Creating id_token with Go

package main

import (
	"fmt"
	"os"
	"time"

	"github.com/golang-jwt/jwt/v4"
)

const PRIVATE_KEY = "<env><partner_name>privatekey.pem"

func main() {
	// Read private key from file
	privateKeyBuffer, err := os.ReadFile(PRIVATE_KEY)
	if err != nil {
		fmt.Println("error reading private key file:", err)
		return
	}

	// Parse private key
	key, err := jwt.ParseRSAPrivateKeyFromPEM(privateKeyBuffer)
	if err != nil {
		fmt.Println("error parsing private key: ", err)
		return
	}

	// Create token with claims
	token := jwt.NewWithClaims(jwt.SigningMethodRS512, jwt.MapClaims{
		"stockal_username": "<stockal-customer-id>",
		"exp":              time.Now().Add(time.Minute * 1).Unix(),
		"aud":              "stockal.com",
		"iss":              "<YOUR_PARTNER_CODE>",
	})

	// Sign token
	signedString, err := token.SignedString(key)
	if err != nil {
		fmt.Println("error signing token: ", err)
		return
	}

	fmt.Println(signedString)
}