$.ajax({
url: 'https://api.createsend.com/api/v3.2/clients/c22943ffb203b99e7891ceef35cc513cc/campaigns.json',
dataType: 'json',
type: 'GET',
headers:{
    'Access-Control-Allow-Origin':'*',
    'Content-Type':'application/json'
},
data:{user: '4fab6ca290307698d781689313baa102c'},
success: function(data){
    console.log(data);
}
})