curl --request POST \
  --url https://api.pagecall.com/v1/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "user_id": "external_user_102932",
  "name": "scotty",
  "profile_url": "https://www.gravatar.com/avatar/00000000000000000000000000000000?d=mp&f=y",
  "default_member_type": "guest"
}'

{
  "user": {
    "user_id": "external_user_102932",
    "name": "scotty",
    "profile_url": "https://www.gravatar.com/avatar/00000000000000000000000000000000?d=mp&f=y",
    "default_member_type": "guest",
    "access_token": "TfowtRYBs0E_trzoTaCmAXKzB1JxDDhi",
    "created_at": "2023-01-01T01:00:00.000Z",
    "updated_at": "2023-01-01T01:00:00.000Z"
  }
}