I had a look into your transaction. If you open the transaction in wallee you can find more information why the transasction failed.
In your case the issue is:
> There is an issue with the configuration. Please check the 'Merchant
> Id', 'Secret Key' and 'Secret Key Version' settings in the procesor
> configuration.
So please verify the credentials of your processor configuration. If this does not help please create an issue using the support button in wallee as this is a specific issue to your setup.