curl --request GET \
  --url https://pub-api.conversion.ai/api/v1/contacts/{email}

{
  "data": {
    "audienceId": "<string>",
    "companyId": "<string>",
    "createdAt": "<string>",
    "email": "<string>",
    "id": "<string>",
    "subscriptionStatus": "SUBSCRIBED",
    "syncToCrm": true,
    "variables": {}
  },
  "httpStatus": 123,
  "message": "<string>"
}