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

[
  {
    "id": "<string>",
    "name": "<string>",
    "description": "<string>",
    "permissions": "<string>",
    "position": 123,
    "color": 123,
    "colors": {
      "primary_color": 123,
      "secondary_color": 123,
      "tertiary_color": 123
    },
    "hoist": true,
    "managed": true,
    "mentionable": true,
    "icon": "<string>",
    "unicode_emoji": "<string>",
    "flags": 123,
    "tags": {
      "premium_subscriber": "<unknown>",
      "bot_id": "<string>",
      "integration_id": "<string>",
      "subscription_listing_id": "<string>",
      "available_for_purchase": "<unknown>",
      "guild_connections": "<unknown>"
    }
  }
]