public Builder setCode(int value) {
            copyOnWrite();
            instance.setCode(value);
            return this;
        }
<code>optional int32 code = 5;</code>

@param value The code to set.
@return This builder for chaining.
turms-client-kotlin/src/main/java/im/turms/client/model/proto/notification/TurmsNotification.java