using RestSharp;


var options = new RestClientOptions("http://localhost:53294/api/v1/Agents/Import/PreviewImport");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "Bearer <token>");
request.AddJsonBody("{\n  \"ImportLines\": [\n    {\n      \"Values\": [\n        \"<string>\"\n      ],\n      \"Selected\": true,\n      \"ExternalKey\": \"<string>\",\n      \"SourceLine\": 123,\n      \"TableRight\": {\n        \"Mask\": \"<string>\",\n        \"Reason\": \"<string>\"\n      },\n      \"FieldProperties\": {}\n    }\n  ],\n  \"ColumnDefinition\": [\n    \"<string>\"\n  ],\n  \"Culture\": \"<string>\",\n  \"Context\": \"<string>\"\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    ImportLines: [
      {
        Values: ['<string>'],
        Selected: true,
        ExternalKey: '<string>',
        SourceLine: 123,
        TableRight: {Mask: '<string>', Reason: '<string>'},
        FieldProperties: {}
      }
    ],
    ColumnDefinition: ['<string>'],
    Culture: '<string>',
    Context: '<string>'
  })
};

fetch('http://localhost:53294/api/v1/Agents/Import/PreviewImport', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "53294",
  CURLOPT_URL => "http://localhost:53294/api/v1/Agents/Import/PreviewImport",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'ImportLines' => [
        [
                'Values' => [
                                '<string>'
                ],
                'Selected' => true,
                'ExternalKey' => '<string>',
                'SourceLine' => 123,
                'TableRight' => [
                                'Mask' => '<string>',
                                'Reason' => '<string>'
                ],
                'FieldProperties' => [
                                
                ]
        ]
    ],
    'ColumnDefinition' => [
        '<string>'
    ],
    'Culture' => '<string>',
    'Context' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "http://localhost:53294/api/v1/Agents/Import/PreviewImport"

payload = {
    "ImportLines": [
        {
            "Values": ["<string>"],
            "Selected": True,
            "ExternalKey": "<string>",
            "SourceLine": 123,
            "TableRight": {
                "Mask": "<string>",
                "Reason": "<string>"
            },
            "FieldProperties": {}
        }
    ],
    "ColumnDefinition": ["<string>"],
    "Culture": "<string>",
    "Context": "<string>"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    ImportLines: [
      {
        Values: ['<string>'],
        Selected: true,
        ExternalKey: '<string>',
        SourceLine: 123,
        TableRight: {Mask: '<string>', Reason: '<string>'},
        FieldProperties: {}
      }
    ],
    ColumnDefinition: ['<string>'],
    Culture: '<string>',
    Context: '<string>'
  })
};

fetch('http://localhost:53294/api/v1/Agents/Import/PreviewImport', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

[
  {
    "Values": [
      "<string>"
    ],
    "Selected": true,
    "Operation": "Unknown",
    "Type": "Unknown",
    "ExternalKey": "<string>",
    "SourceLine": 123,
    "TableRight": {
      "Mask": "<string>",
      "Reason": "<string>"
    },
    "FieldProperties": {}
  }
]