Thank you. Currently this does not seem to work yet. I think I need to keep testing there.
I first tried to write a small API myself. But there I have the problem that the connection works with CURL, but not with the Laravel Http Client. But that's probably another topic :)
I think the API will not work for me because I need a dynamic API key and not one that is stored in the .env. Maybe I should test my API again and post the error here
Butschster\Kraken\Responses\AccountBalanceResponse::setBalances(): Argument #1 ($assets) must be of type array, null given, called in .....\vendor\jms\serializer\src\Accessor\DefaultAccessorStrategy.php on line 117
Edit
But I get this error as soon as I paste "\Butschster\Kraken\Contracts\Client $client".