curl --request POST \
  --url https://api.sandbox.lead.bank/v2/files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --form file=@example-file \
  --form type=loan_agreement \
  --form 'metadata={};type=application/json'

import requests

url = "https://api.sandbox.lead.bank/v2/files"

files = { "file": ("example-file", open("example-file", "rb")) }
files["metadata"] = (None, "{}", "application/json")
payload = { "type": "loan_agreement" }
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>"
}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.text)

const form = new FormData();
form.append('file', '<string>');
form.append('type', 'loan_agreement');
form.append('metadata', '{}');

const options = {
  method: 'POST',
  headers: {'Idempotency-Key': '<idempotency-key>', Authorization: 'Bearer <token>'}
};

options.body = form;

fetch('https://api.sandbox.lead.bank/v2/files', 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.sandbox.lead.bank/v2/files",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"type\"\r\n\r\nloan_agreement\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"metadata\"\r\nContent-Type: application/json\r\n\r\n{}\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data",
    "Idempotency-Key: <idempotency-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.sandbox.lead.bank/v2/files"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"type\"\r\n\r\nloan_agreement\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"metadata\"\r\nContent-Type: application/json\r\n\r\n{}\r\n-----011000010111000001101001--")

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

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("Authorization", "Bearer <token>")

	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.sandbox.lead.bank/v2/files")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"type\"\r\n\r\nloan_agreement\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"metadata\"\r\nContent-Type: application/json\r\n\r\n{}\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sandbox.lead.bank/v2/files")

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

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"type\"\r\n\r\nloan_agreement\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"metadata\"\r\nContent-Type: application/json\r\n\r\n{}\r\n-----011000010111000001101001--"

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

{
  "id": "file_7RwQ2mK9pL4xT1vN8jS5",
  "uploaded_by": "partner",
  "file_name": "loan_agreement_acct_4471.pdf",
  "type": "loan_agreement",
  "content_type": "application/pdf",
  "size_bytes": 184233,
  "checksum": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "created_at": "2026-09-14T14:22:01Z",
  "updated_at": "2026-09-14T14:22:01Z",
  "metadata": {}
}

{
  "code": "idempotency_key_missing",
  "message": "The Idempotency-Key header is required for this endpoint."
}

{
  "code": "token_invalid",
  "message": "The bearer token is missing, expired, or invalid."
}

{
  "code": "idempotency_key_in_use",
  "message": "A concurrent request using this Idempotency-Key is still in flight."
}

{
  "code": "content_too_large",
  "message": "The request is over a size limit for this endpoint. Make it smaller and resend it.",
  "errors": [
    {
      "code": "body_too_large",
      "message": "file is 52428801 bytes, which is over this endpoint's 50 MB limit.",
      "parameters": [
        "file"
      ]
    }
  ]
}

{
  "code": "parameters_invalid",
  "message": "One or more parameters are invalid.",
  "errors": [
    {
      "code": "required",
      "message": "The file part is required and must include a filename and Content-Type.",
      "parameters": [
        "file"
      ]
    }
  ]
}

{
  "code": "rate_limit_exceeded",
  "message": "You have exceeded the rate limit for this endpoint. Retry with backoff."
}

{
  "code": "internal_server_error",
  "message": "Something went wrong on our end. Contact Lead with the Request-Id if this persists."
}

{
  "code": "service_unavailable",
  "message": "The service is temporarily unavailable. Retry after the indicated delay."
}

{
  "code": "gateway_timeout",
  "message": "An upstream system timed out. Retry with backoff."
}