what permission is needed to listen for MessageReactionAdd in user's DMs?

const client = new Client({
  intents: [
    GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.GuildMessageReactions,
  ],
  partials: [Partials.Message, Partials.Channel, Partials.Reaction, Partials.User],
});

export let name = Events.MessageReactionAdd

export async function execute (reaction, user) {

  // When a reaction is received, check if the structure is partial
  if (reaction.partial) {
    // If the message this reaction belongs to was removed, the fetching might result in an API error which should be handled
    try {
      await reaction.fetch();
    } catch (error) {
      console.error('Something went wrong when fetching the message:', error);
      // Return as `reaction.message.author` may be undefined/null
      return;
    }
  }

  // Now the message has been cached and is fully available
  console.log(`${reaction.message.author}'s message "${reaction.message.content}" gained a reaction!`);
  // The reaction is now also fully available and the properties will be reflected accurately:
  console.log(`${reaction.count} user(s) have given the same reaction to this message!`);

}