curl --request PUT \
  --url https://api.bunny.net/mc/registries/{registryId} \
  --header 'AccessKey: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "displayName": "<string>",
  "type": "DockerHub",
  "passwordCredentials": {
    "userName": "<string>",
    "password": "<string>"
  }
}
'

{
  "id": 123,
  "error": "<string>",
  "status": "Saved"
}