curl --request GET \
  --url https://discord.com/api/v10/applications/{application_id}/guilds/{guild_id}/commands/{command_id} \
  --header 'Authorization: <api-key>'

{
  "id": "<string>",
  "application_id": "<string>",
  "version": "<string>",
  "default_member_permissions": "<string>",
  "type": 123,
  "name": "<string>",
  "description": "<string>",
  "name_localized": "<string>",
  "name_localizations": {},
  "description_localized": "<string>",
  "description_localizations": {},
  "guild_id": "<string>",
  "dm_permission": true,
  "contexts": [
    123
  ],
  "integration_types": [
    123
  ],
  "options": [
    {
      "type": 11,
      "name": "<string>",
      "description": "<string>",
      "name_localized": "<string>",
      "name_localizations": {},
      "description_localized": "<string>",
      "description_localizations": {},
      "required": true
    }
  ],
  "nsfw": true
}