Proof for a username

curl --request GET \
  --url https://hub-api.neynar.com/v1/userNameProofByName \
  --header 'x-api-key: <api-key>'

{
  "timestamp": 123,
  "name": "neynar",
  "owner": "<string>",
  "signature": "aSDinaTvuI8gbWludGxpZnk=",
  "fid": 1,
  "type": "USERNAME_TYPE_FNAME"
}