Upload files to a document item

curl --request POST \
  --url https://api.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/documents \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --header 'x-api-key: <api-key>' \
  --form 'files=<string>' \
  --form files.items='@example-file'

import requests

url = "https://api.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/documents"

files = { "files.items": ("example-file", open("example-file", "rb")) }
payload = { "files": "<string>" }
headers = {
    "Authorization": "Bearer <token>",
    "x-api-key": "<api-key>"
}

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

print(response.text)

const form = new FormData();
form.append('files', '<string>');
form.append('files.items', '{
  "fileName": "example-file"
}');

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'x-api-key': '<api-key>'}
};

options.body = form;

fetch('https://api.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/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://api.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/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 => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files\"\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files.items\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n{\r\n  \"fileName\": \"example-file\"\r\n}\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data",
    "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.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/documents"

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

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

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("x-api-key", "<api-key>")

	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.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/documents")
  .header("Authorization", "Bearer <token>")
  .header("x-api-key", "<api-key>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files\"\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files.items\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n{\r\n  \"fileName\": \"example-file\"\r\n}\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.balampay.com/sandbox/v1/rfis/{rfi_id}/items/{item_id}/documents")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["x-api-key"] = '<api-key>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files\"\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"files.items\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n{\r\n  \"fileName\": \"example-file\"\r\n}\r\n-----011000010111000001101001--"

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

{
  "item": {
    "item_id": "1a2b3c4d-5e6f-4708-9a1b-2c3d4e5f6a7b",
    "ordinal": 1,
    "prompt": "Upload the certificate of good standing issued in the last 90 days.",
    "answer_type": "document",
    "answer_spec": {
      "max_files": 3
    },
    "target_key": null,
    "subject": null,
    "status": "answered",
    "answer_value": null,
    "documents": [
      {
        "document_id": "9f8e7d6c-5b4a-4321-8765-4321fedcba98",
        "file_name": "certificate-of-good-standing.pdf",
        "mime_type": "application/pdf",
        "size_bytes": 184320,
        "checksum": "9f2b1c4e8a6d3f705b1e9c8d7a6f5e4d3c2b1a0908f7e6d5c4b3a2918070605",
        "uploaded_at": "2026-09-02T09:15:00.000Z"
      }
    ],
    "review_note": null,
    "updated_at": "2026-09-02T09:15:00.000Z",
    "returned_at": null
  }
}

{
  "code": "validation_error",
  "message": "Invalid request body"
}

{
  "code": "invalid_request",
  "message": "The request could not be authenticated. Check the x-api-key and Authorization headers."
}

{
  "code": "not_found",
  "message": "RFI not found"
}

{
  "code": "conflict",
  "message": "This RFI is closed and no longer accepts answers"
}

{
  "code": "unprocessable",
  "message": "The answer does not satisfy the item's answer_spec"
}