Hi i need some help Can you guys please tell me how can i create this go code which package and modules i need to import to complete this please provide me complete poc so i can make things work

func createToken(apiKey string, nonce int64, endpoint string, privateKey *x509.PrivateKey) string {
    // Generate a JWT
    token := jwt.NewWithClaims(jwt.SigningMethodES256, jwt.MapClaims{
        "api-key": apiKey,
        "nonce":   nonce,
        "uri":     endpoint,
        "exp":     jwt.NewNumericDate(time.Now().Add(time.Hour * 72)),
    })

    tokenString, err := token.SignedString(privateKey)
    if err != nil {
        log.Fatal(err)
    }

    return tokenString
}

i want to view the response like this after base64 decode

{
    "exp": 1694673536,
    "api-key": "hsk_89c6d8a1d313461db1a37dd0d1f88661",
    "uri": "/v1/validate",
    "nonce": 4242658338,
    "digest": "wij3HROZrND_YdAzUHHuqJUYgUchg7EKg8bPzCk3LMXOq9c00UxCL2g82A6TcPxoo2w_eWDDJUf-dD18vvOKLg=="
}

Thanks