Filter by visitor id. Supports both single id values (e.g., id=66623dc53090242657393910) and array operations (e.g., id[$in]=66623dc53090242657393910,66623dbf309024265739390a).
Note: Multiple values in simple string format (e.g., id=66623dc53090242657393910,66623dbf309024265739390a) are not allowed - use id[$in] format instead.