ChannelReactionDeleteRequest constructor
      
      ChannelReactionDeleteRequest({ 
    
    
- required ChannelType channelType,
- required String channelUrl,
- required int messageId,
- required String key,
- String? userId,
Implementation
ChannelReactionDeleteRequest({
  required ChannelType channelType,
  required String channelUrl,
  required int messageId,
  required String key,
  String? userId,
}) : super(userId: userId) {
  url = '${channelType.urlString}/$channelUrl/messages/$messageId/reactions';
  body = {'reaction': key};
}