curl --request POST \
  --url https://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-documents \
  --header 'Content-Type: application/json' \
  --header 'X-Auth-Token: <x-auth-token>' \
  --header 'platform: <platform>' \
  --header 'uuid: <uuid>' \
  --data '
{
  "customerCode": "CUST123456",
  "attachedDocument": [
    {
      "name": "proof_of_address.jpg",
      "idType": "PROOF_OF_ADDRESS",
      "file_base64": "base64EncodedStringOfYourFile..."
    }
  ]
}
'

import requests

url = "https://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-documents"

payload = {
    "customerCode": "CUST123456",
    "attachedDocument": [
        {
            "name": "proof_of_address.jpg",
            "idType": "PROOF_OF_ADDRESS",
            "file_base64": "base64EncodedStringOfYourFile..."
        }
    ]
}
headers = {
    "platform": "<platform>",
    "uuid": "<uuid>",
    "X-Auth-Token": "<x-auth-token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    platform: '<platform>',
    uuid: '<uuid>',
    'X-Auth-Token': '<x-auth-token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    customerCode: 'CUST123456',
    attachedDocument: [
      {
        name: 'proof_of_address.jpg',
        idType: 'PROOF_OF_ADDRESS',
        file_base64: 'base64EncodedStringOfYourFile...'
      }
    ]
  })
};

fetch('https://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-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://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-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([
    'customerCode' => 'CUST123456',
    'attachedDocument' => [
        [
                'name' => 'proof_of_address.jpg',
                'idType' => 'PROOF_OF_ADDRESS',
                'file_base64' => 'base64EncodedStringOfYourFile...'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Auth-Token: <x-auth-token>",
    "platform: <platform>",
    "uuid: <uuid>"
  ],
]);

$response = curl_exec($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://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-documents"

	payload := strings.NewReader("{\n  \"customerCode\": \"CUST123456\",\n  \"attachedDocument\": [\n    {\n      \"name\": \"proof_of_address.jpg\",\n      \"idType\": \"PROOF_OF_ADDRESS\",\n      \"file_base64\": \"base64EncodedStringOfYourFile...\"\n    }\n  ]\n}")

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

	req.Header.Add("platform", "<platform>")
	req.Header.Add("uuid", "<uuid>")
	req.Header.Add("X-Auth-Token", "<x-auth-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://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-documents")
  .header("platform", "<platform>")
  .header("uuid", "<uuid>")
  .header("X-Auth-Token", "<x-auth-token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerCode\": \"CUST123456\",\n  \"attachedDocument\": [\n    {\n      \"name\": \"proof_of_address.jpg\",\n      \"idType\": \"PROOF_OF_ADDRESS\",\n      \"file_base64\": \"base64EncodedStringOfYourFile...\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{tenant}.fincode.software/api/v6/services/documentmanagement/attach-documents")

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

request = Net::HTTP::Post.new(url)
request["platform"] = '<platform>'
request["uuid"] = '<uuid>'
request["X-Auth-Token"] = '<x-auth-token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"customerCode\": \"CUST123456\",\n  \"attachedDocument\": [\n    {\n      \"name\": \"proof_of_address.jpg\",\n      \"idType\": \"PROOF_OF_ADDRESS\",\n      \"file_base64\": \"base64EncodedStringOfYourFile...\"\n    }\n  ]\n}"

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