curl --request PATCH \
  --url https://api.sippet.ai/api/contacts/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "id": "<string>",
    "attributes": {
      "email": "<string>",
      "full_name": "<string>",
      "notes": "<string>",
      "phone_e164": "<string>"
    },
    "relationships": {},
    "type": "Contact"
  }
}
'

{
  "data": {
    "id": "<string>",
    "type": "<string>",
    "attributes": {
      "full_name": "<string>",
      "email": "<string>",
      "notes": "<string>",
      "phone_e164": "<string>"
    },
    "relationships": {}
  },
  "included": [
    "<unknown>"
  ],
  "meta": {}
}