{
   "contractors":{
      "parameters":{
         "page":"2",
         "limit":"20",
         "fields":[
            {
               "field":"Contractor.id"
            },
            {
               "field":"Contractor.name"
            },
            {
               "field":"Contractor.altname"
            },
            {
               "field":"Contractor.nip"
            },
            {
               "field":"Contractor.email"
            }
         ]
      }
   }
}