https://blog.canopas.com/integrate-google-recaptcha-enterprise-using-vue-js-and-golang-60a9335e80ac - recaptcha-client

recaptcha-client.go

ctx := context.Background()

/** convert base64 formetted JSON to bytearray */
credBytes, err := b64.StdEncoding.DecodeString(os.Getenv("JSON_BASE64"))
if err != nil {
	return false, err
}

/** create reCaptcha client with JSON bytearray */
client, err := recaptcha.NewClient(ctx, option.WithCredentialsJSON(credBytes))
if err != nil {
	return false, err
}

/** close client when it's done */
defer client.Close()