How do I create a new Profile via Klaviyo's API?

I’m not using Javascript but from the Klaviyo API revision 2022-10-17.  I can successfully create a profile using the following payload:

payload = {
  data: {
    type: 'profile',
    attributes: {
      email: user.email,
      phone_number: include_phone ? phone_number : nil,
      first_name: user.first_name,
      last_name: user.last_name
    }
  } 
}

Note the include_phone is a boolean that allows me to include the phone if I think it’s legit.  Klaviyo will error out on fake phone number so you really need to verify ahead, or retry without a phone number if the request fails.

This is a POST request to:

"https://a.klaviyo.com/api/profiles/"