Summary: Pearler should automatically route the order to Cboe Australia if it will get a better price there.
More details: Cboe Australia (CXA, formerly Chi-X Australia) is an alternative exchange to ASX. It lists most of the stocks and ETFs that are on ASX and has about 17% volume share.
Sometimes you can trade a stock at a better price (tighter spread) on Cboe Australia than ASX. Around 15% of trades on Cboe Australia are inside the ASX spread (i.e. a better price).
If Pearler routes orders to Cboe Australia when there is a better price there, then Pearler customers will save money.