curl --request POST \
  --url https://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --header 'X-Forwarded-For: <x-forwarded-for>' \
  --header 'X-Forwarded-From: <x-forwarded-from>' \
  --header 'X-Tenant-ID: <x-tenant-id>' \
  --header 'deviceId: <deviceid>' \
  --header 'platform: <platform>' \
  --data '
{
  "documentType": "PASSPORT",
  "fileName": "passport.pdf",
  "fileContent": "JVBERi0xLjQK...",
  "mimeType": "application/pdf",
  "verificationId": "825f84a5-a709-4e58-a80f-b51871d94cfb",
  "customerId": "2dac1793-ab48-420c-b0b5-01292302e188"
}
'

import requests

url = "https://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents"

payload = {
    "documentType": "PASSPORT",
    "fileName": "passport.pdf",
    "fileContent": "JVBERi0xLjQK...",
    "mimeType": "application/pdf",
    "verificationId": "825f84a5-a709-4e58-a80f-b51871d94cfb",
    "customerId": "2dac1793-ab48-420c-b0b5-01292302e188"
}
headers = {
    "X-Forwarded-For": "<x-forwarded-for>",
    "X-Tenant-ID": "<x-tenant-id>",
    "X-Forwarded-From": "<x-forwarded-from>",
    "platform": "<platform>",
    "deviceId": "<deviceid>",
    "Authorization": "<authorization>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Forwarded-For': '<x-forwarded-for>',
    'X-Tenant-ID': '<x-tenant-id>',
    'X-Forwarded-From': '<x-forwarded-from>',
    platform: '<platform>',
    deviceId: '<deviceid>',
    Authorization: '<authorization>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    documentType: 'PASSPORT',
    fileName: 'passport.pdf',
    fileContent: 'JVBERi0xLjQK...',
    mimeType: 'application/pdf',
    verificationId: '825f84a5-a709-4e58-a80f-b51871d94cfb',
    customerId: '2dac1793-ab48-420c-b0b5-01292302e188'
  })
};

fetch('https://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents', 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://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents",
  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([
    'documentType' => 'PASSPORT',
    'fileName' => 'passport.pdf',
    'fileContent' => 'JVBERi0xLjQK...',
    'mimeType' => 'application/pdf',
    'verificationId' => '825f84a5-a709-4e58-a80f-b51871d94cfb',
    'customerId' => '2dac1793-ab48-420c-b0b5-01292302e188'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <authorization>",
    "Content-Type: application/json",
    "X-Forwarded-For: <x-forwarded-for>",
    "X-Forwarded-From: <x-forwarded-from>",
    "X-Tenant-ID: <x-tenant-id>",
    "deviceId: <deviceid>",
    "platform: <platform>"
  ],
]);

$response = curl_exec($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://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents"

	payload := strings.NewReader("{\n  \"documentType\": \"PASSPORT\",\n  \"fileName\": \"passport.pdf\",\n  \"fileContent\": \"JVBERi0xLjQK...\",\n  \"mimeType\": \"application/pdf\",\n  \"verificationId\": \"825f84a5-a709-4e58-a80f-b51871d94cfb\",\n  \"customerId\": \"2dac1793-ab48-420c-b0b5-01292302e188\"\n}")

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

	req.Header.Add("X-Forwarded-For", "<x-forwarded-for>")
	req.Header.Add("X-Tenant-ID", "<x-tenant-id>")
	req.Header.Add("X-Forwarded-From", "<x-forwarded-from>")
	req.Header.Add("platform", "<platform>")
	req.Header.Add("deviceId", "<deviceid>")
	req.Header.Add("Authorization", "<authorization>")
	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://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents")
  .header("X-Forwarded-For", "<x-forwarded-for>")
  .header("X-Tenant-ID", "<x-tenant-id>")
  .header("X-Forwarded-From", "<x-forwarded-from>")
  .header("platform", "<platform>")
  .header("deviceId", "<deviceid>")
  .header("Authorization", "<authorization>")
  .header("Content-Type", "application/json")
  .body("{\n  \"documentType\": \"PASSPORT\",\n  \"fileName\": \"passport.pdf\",\n  \"fileContent\": \"JVBERi0xLjQK...\",\n  \"mimeType\": \"application/pdf\",\n  \"verificationId\": \"825f84a5-a709-4e58-a80f-b51871d94cfb\",\n  \"customerId\": \"2dac1793-ab48-420c-b0b5-01292302e188\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.finhub.cloud/api/v2.1/verifications/{verificationId}/documents")

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

request = Net::HTTP::Post.new(url)
request["X-Forwarded-For"] = '<x-forwarded-for>'
request["X-Tenant-ID"] = '<x-tenant-id>'
request["X-Forwarded-From"] = '<x-forwarded-from>'
request["platform"] = '<platform>'
request["deviceId"] = '<deviceid>'
request["Authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"documentType\": \"PASSPORT\",\n  \"fileName\": \"passport.pdf\",\n  \"fileContent\": \"JVBERi0xLjQK...\",\n  \"mimeType\": \"application/pdf\",\n  \"verificationId\": \"825f84a5-a709-4e58-a80f-b51871d94cfb\",\n  \"customerId\": \"2dac1793-ab48-420c-b0b5-01292302e188\"\n}"

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