curl --request POST \
  --url https://api.example.com/v1/forms/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customer": {
    "phoneNumber": "<string>",
    "email": "<string>",
    "firstName": "<string>",
    "lastName": "<string>",
    "properties": {}
  },
  "fields": [
    {
      "name": "<string>",
      "value": "<string>"
    }
  ],
  "metadata": {}
}
'

{
  "submission": "<string>"
}