$.ajaxSetup({
  headers: {
    'Authorization': "Basic " + btoa("test:1234")
  }
});


$.ajax
({
  type: "GET",
  url: "https://stage01.one-flow.de/cl-customer/api/v1/orders",
  dataType: 'json',
  success: function (ret){
    console.log(ret);
  }
});