curl --request POST \
  --url https://sg.sandbox.api.reap.global/users/{id}/application/documents \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --header 'Reap-Version: <reap-version>' \
  --form documentType=IDENTITY \
  --form 'files=<string>' \
  --form files.0='@example-file' \
  --form files.1='@example-file' \
  --form files.2='@example-file' \
  --form files.3='@example-file' \
  --form files.4='@example-file' \
  --form files.5='@example-file' \
  --form files.6='@example-file' \
  --form files.7='@example-file' \
  --form files.8='@example-file' \
  --form files.9.items.0='@example-file' \
  --form files.9.items.1='@example-file' \
  --form files.9.items.2='@example-file' \
  --form files.9.items.3='@example-file' \
  --form files.9.items.4='@example-file' \
  --form files.9.items.5='@example-file' \
  --form files.9.items.6='@example-file' \
  --form files.9.items.7='@example-file' \
  --form files.9.items.8='@example-file'

const form = new FormData();
form.append('documentType', 'IDENTITY');
form.append('files', '<string>');
form.append('files.0', '{
  "fileName": "example-file"
}');
form.append('files.1', '{
  "fileName": "example-file"
}');
form.append('files.2', '{
  "fileName": "example-file"
}');
form.append('files.3', '{
  "fileName": "example-file"
}');
form.append('files.4', '{
  "fileName": "example-file"
}');
form.append('files.5', '{
  "fileName": "example-file"
}');
form.append('files.6', '{
  "fileName": "example-file"
}');
form.append('files.7', '{
  "fileName": "example-file"
}');
form.append('files.8', '{
  "fileName": "example-file"
}');
form.append('files.9.items.0', '{
  "fileName": "example-file"
}');
form.append('files.9.items.1', '{
  "fileName": "example-file"
}');
form.append('files.9.items.2', '{
  "fileName": "example-file"
}');
form.append('files.9.items.3', '{
  "fileName": "example-file"
}');
form.append('files.9.items.4', '{
  "fileName": "example-file"
}');
form.append('files.9.items.5', '{
  "fileName": "example-file"
}');
form.append('files.9.items.6', '{
  "fileName": "example-file"
}');
form.append('files.9.items.7', '{
  "fileName": "example-file"
}');
form.append('files.9.items.8', '{
  "fileName": "example-file"
}');

const options = {
  method: 'POST',
  headers: {'Reap-Version': '<reap-version>', Authorization: 'Bearer <token>'}
};

options.body = form;

fetch('https://sg.sandbox.api.reap.global/users/{id}/application/documents', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://sg.sandbox.api.reap.global/users/{id}/application/documents"

files = {
    "files.0": ("example-file", open("example-file", "rb")),
    "files.1": ("example-file", open("example-file", "rb")),
    "files.2": ("example-file", open("example-file", "rb")),
    "files.3": ("example-file", open("example-file", "rb")),
    "files.4": ("example-file", open("example-file", "rb")),
    "files.5": ("example-file", open("example-file", "rb")),
    "files.6": ("example-file", open("example-file", "rb")),
    "files.7": ("example-file", open("example-file", "rb")),
    "files.8": ("example-file", open("example-file", "rb")),
    "files.9.items.0": ("example-file", open("example-file", "rb")),
    "files.9.items.1": ("example-file", open("example-file", "rb")),
    "files.9.items.2": ("example-file", open("example-file", "rb")),
    "files.9.items.3": ("example-file", open("example-file", "rb")),
    "files.9.items.4": ("example-file", open("example-file", "rb")),
    "files.9.items.5": ("example-file", open("example-file", "rb")),
    "files.9.items.6": ("example-file", open("example-file", "rb")),
    "files.9.items.7": ("example-file", open("example-file", "rb")),
    "files.9.items.8": ("example-file", open("example-file", "rb"))
}
payload = {
    "documentType": "IDENTITY",
    "files": "<string>"
}
headers = {
    "Reap-Version": "<reap-version>",
    "Authorization": "Bearer <token>"
}

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

print(response.text)

{
  "status": "NOT_STARTED",
  "nextAction": {
    "type": "PROVIDER_SDK",
    "provider": "SUMSUB",
    "sdkToken": "_act-sbx-abc123-xyz789"
  }
}

{
  "error": {
    "code": "INVALID_APPLICATION_STATUS",
    "message": "<string>",
    "detail": {}
  }
}

{
  "error": {
    "code": "VERIFICATION_METHOD_NOT_ENABLED",
    "message": "<string>",
    "detail": {}
  }
}

{
  "error": {
    "code": "USER_NOT_FOUND",
    "message": "<string>",
    "detail": {}
  }
}