curl --request POST \
  --url https://api.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "files": [
    {
      "field": "<string>",
      "fileName": "<string>",
      "contentType": "<string>",
      "documentType": "<string>",
      "sides": [],
      "doubleSided": true,
      "parts": [
        {
          "fileName": "<string>",
          "contentType": "<string>"
        }
      ],
      "maxFileSizeBytes": 2
    }
  ],
  "mode": "proxy"
}
'

import requests

url = "https://api.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare"

payload = {
    "files": [
        {
            "field": "<string>",
            "fileName": "<string>",
            "contentType": "<string>",
            "documentType": "<string>",
            "sides": [],
            "doubleSided": True,
            "parts": [
                {
                    "fileName": "<string>",
                    "contentType": "<string>"
                }
            ],
            "maxFileSizeBytes": 2
        }
    ],
    "mode": "proxy"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    files: [
      {
        field: '<string>',
        fileName: '<string>',
        contentType: '<string>',
        documentType: '<string>',
        sides: [],
        doubleSided: true,
        parts: [{fileName: '<string>', contentType: '<string>'}],
        maxFileSizeBytes: 2
      }
    ],
    mode: 'proxy'
  })
};

fetch('https://api.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare', 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.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare",
  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([
    'files' => [
        [
                'field' => '<string>',
                'fileName' => '<string>',
                'contentType' => '<string>',
                'documentType' => '<string>',
                'sides' => [
                                
                ],
                'doubleSided' => true,
                'parts' => [
                                [
                                                                'fileName' => '<string>',
                                                                'contentType' => '<string>'
                                ]
                ],
                'maxFileSizeBytes' => 2
        ]
    ],
    'mode' => 'proxy'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($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.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare"

	payload := strings.NewReader("{\n  \"files\": [\n    {\n      \"field\": \"<string>\",\n      \"fileName\": \"<string>\",\n      \"contentType\": \"<string>\",\n      \"documentType\": \"<string>\",\n      \"sides\": [],\n      \"doubleSided\": true,\n      \"parts\": [\n        {\n          \"fileName\": \"<string>\",\n          \"contentType\": \"<string>\"\n        }\n      ],\n      \"maxFileSizeBytes\": 2\n    }\n  ],\n  \"mode\": \"proxy\"\n}")

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

	req.Header.Add("x-api-key", "<api-key>")
	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.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"files\": [\n    {\n      \"field\": \"<string>\",\n      \"fileName\": \"<string>\",\n      \"contentType\": \"<string>\",\n      \"documentType\": \"<string>\",\n      \"sides\": [],\n      \"doubleSided\": true,\n      \"parts\": [\n        {\n          \"fileName\": \"<string>\",\n          \"contentType\": \"<string>\"\n        }\n      ],\n      \"maxFileSizeBytes\": 2\n    }\n  ],\n  \"mode\": \"proxy\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.blockradar.co/v1/onboarding/cases/{caseId}/uploads/prepare")

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

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"files\": [\n    {\n      \"field\": \"<string>\",\n      \"fileName\": \"<string>\",\n      \"contentType\": \"<string>\",\n      \"documentType\": \"<string>\",\n      \"sides\": [],\n      \"doubleSided\": true,\n      \"parts\": [\n        {\n          \"fileName\": \"<string>\",\n          \"contentType\": \"<string>\"\n        }\n      ],\n      \"maxFileSizeBytes\": 2\n    }\n  ],\n  \"mode\": \"proxy\"\n}"

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

{
  "statusCode": 200,
  "message": "Onboarding upload targets prepared successfully",
  "data": {
    "caseId": "71d6b5ac-6312-43eb-b389-789d214bbda2",
    "uploads": [
      {
        "field": "identityDocument",
        "document": {
          "mode": "proxy",
          "proxyUploadId": "upload_01K0PZV5X8JQ4V9N0P7K2M6C3F",
          "method": "POST",
          "providerReference": "document_839201",
          "documentType": "passport",
          "expiresAt": "2026-07-22T14:30:00.000Z",
          "sides": [
            "front"
          ],
          "accept": [
            "image/jpeg",
            "image/png",
            "application/pdf"
          ]
        }
      }
    ]
  }
}