Required. The message users reacted to. Format: spaces/{space}/messages/{message}

Optional. A query filter. You can filter reactions by emoji (either emoji.unicode or emoji.custom_emoji.uid) and user (user.name). To filter reactions for multiple emojis or users, join similar fields with the OR operator, such as emoji.unicode = "🙂" OR emoji.unicode = "👍" and user.name = "users/AAAAAA" OR user.name = "users/BBBBBB". To filter reactions by emoji and user, use the AND operator, such as emoji.unicode = "🙂" AND user.name = "users/AAAAAA". If your query uses both AND and OR, group them with parentheses. For example, the following queries are valid: user.name = "users/{user}" emoji.unicode = "🙂" emoji.custom_emoji.uid = "{uid}" emoji.unicode = "🙂" OR emoji.unicode = "👍" emoji.unicode = "🙂" OR emoji.custom_emoji.uid = "{uid}" emoji.unicode = "🙂" AND user.name = "users/{user}" (emoji.unicode = "🙂" OR emoji.custom_emoji.uid = "{uid}") AND user.name = "users/{user}" The following queries are invalid: emoji.unicode = "🙂" AND emoji.unicode = "👍" emoji.unicode = "🙂" AND emoji.custom_emoji.uid = "{uid}" emoji.unicode = "🙂" OR user.name = "users/{user}" emoji.unicode = "🙂" OR emoji.custom_emoji.uid = "{uid}" OR user.name = "users/{user}" emoji.unicode = "🙂" OR emoji.custom_emoji.uid = "{uid}" AND user.name = "users/{user}" Invalid queries are rejected with an INVALID_ARGUMENT error.

Optional. The maximum number of reactions returned. The service can return fewer reactions than this value. If unspecified, the default value is 25. The maximum value is 200; values above 200 are changed to 200.

Optional. (If resuming from a previous query.) A page token received from a previous list reactions call. Provide this to retrieve the subsequent page. When paginating, the filter value should match the call that provided the page token. Passing a different value might lead to unexpected results.