upd(internal): encode ChannelID as string

internal/payload/outgoing.go

@@ -33,7 +33,7 @@ func Message(ctx context.Context, msg *messagingTypes.Message) *outgoing.Message
 	return &outgoing.Message{
 		ID:        msg.ID,
 		Type:      string(msg.Type),
-		ChannelID: Uint64toa(msg.ChannelID),
+		ChannelID: msg.ChannelID,
 		Message:   msg.Message,
 		UserID:    msg.UserID,
 

internal/payload/outgoing/message.go

@@ -10,7 +10,7 @@ type (
 		ID        uint64 `json:"messageID,string"`
 		Type      string `json:"type"`
 		Message   string `json:"message"`
-		ChannelID string `json:"channelID"`
+		ChannelID uint64 `json:"channelID,string"`
 		UserID    uint64 `json:"userID,string"`
 
 		ReplyTo     uint64   `json:"replyTo,omitempty,string"`