curl --request POST \
  --url https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mapping": {
    "nameColumn": "Name",
    "phoneColumn": "B",
    "attributeColumns": [
      "City"
    ]
  }
}
'

import requests

url = "https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview"

payload = { "mapping": {
        "nameColumn": "Name",
        "phoneColumn": "B",
        "attributeColumns": ["City"]
    } }
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({mapping: {nameColumn: 'Name', phoneColumn: 'B', attributeColumns: ['City']}})
};

fetch('https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview",
  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([
    'mapping' => [
        'nameColumn' => 'Name',
        'phoneColumn' => 'B',
        'attributeColumns' => [
                'City'
        ]
    ]
  ]),
  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;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview"

	payload := strings.NewReader("{\n  \"mapping\": {\n    \"nameColumn\": \"Name\",\n    \"phoneColumn\": \"B\",\n    \"attributeColumns\": [\n      \"City\"\n    ]\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"mapping\": {\n    \"nameColumn\": \"Name\",\n    \"phoneColumn\": \"B\",\n    \"attributeColumns\": [\n      \"City\"\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.upliftai.org/v1/contact-lists/uploads/{uploadId}/preview")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"mapping\": {\n    \"nameColumn\": \"Name\",\n    \"phoneColumn\": \"B\",\n    \"attributeColumns\": [\n      \"City\"\n    ]\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "summary": {
    "willBeCalled": 2,
    "excluded": {
      "invalidPhone": 0,
      "missingName": 0,
      "duplicate": 0,
      "dnc": 0,
      "recentlyCalled": 0
    },
    "errors": []
  },
  "detectedMapping": {
    "nameColumn": "Name",
    "phoneColumn": "Phone",
    "attributeColumns": [
      "City"
    ]
  },
  "sample": [
    {
      "name": "عائشہ صدیقی",
      "phone": "+923000000001",
      "attributes": {
        "City": "لاہور"
      }
    },
    {
      "name": "بلال احمد",
      "phone": "+923000000002",
      "attributes": {
        "City": "کراچی"
      }
    }
  ],
  "total": 2,
  "columns": [
    "Name",
    "Phone",
    "City",
    "Appointment"
  ],
  "mappingIssues": []
}

{
  "message": [
    "mapping must be an object"
  ],
  "error": "Bad Request",
  "statusCode": 400
}

{
  "message": "invalid authorization",
  "error": "Unauthorized",
  "statusCode": 401
}

{
  "message": "Forbidden resource",
  "error": "Forbidden",
  "statusCode": 403
}

{
  "message": "Upload not found: 00000000-0000-4000-8000-000000000000",
  "error": "Not Found",
  "statusCode": 404
}