curl --request POST \
  --url https://api.supernotes.app/v1/friends \
  --header 'Api-Key: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email_or_username": "<string>"
}
'

{
  "other_user": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "username": "<string>",
    "first_name": "<string>",
    "last_name": "<string>",
    "bio": "<string>",
    "photo": "<string>"
  },
  "modified_when": "2023-11-07T05:31:56Z"
}