curl --request POST \
  --url https://{your-subdomain}.neetoform.com/api/external/v2/forms/{form_id}/access_control_invitations \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <x-api-key>' \
  --data '
{
  "emails": [
    "oliver.smith@example.com"
  ]
}
'

const options = {
  method: 'POST',
  headers: {'X-Api-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({emails: ['oliver.smith@example.com']})
};

fetch('https://{your-subdomain}.neetoform.com/api/external/v2/forms/{form_id}/access_control_invitations', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{your-subdomain}.neetoform.com/api/external/v2/forms/{form_id}/access_control_invitations"

payload = { "emails": ["oliver.smith@example.com"] }
headers = {
    "X-Api-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "invited_emails": [
    "oliver.smith@example.com"
  ]
}

{
  "error": "Form does not exist."
}

{
  "error": "Invitations can be added only when the form's access is restricted to invited emails."
}