Creates a member

Example request

{
  "personalDetails": {
    "contactDetails": {
      "address": {
        "line1": "60 Khyber Pass Road",
        "suburb": "Grafton",
        "city": "Auckland",
        "postCode": "1023",
        "country": "New Zealand"
      }
    },
    "preferences": {
      "languageTag": "en-US"
    }
  }
}