It is unfortunately usually an uphill battle for us with many brokers on this issue and such replies are not uncommon. It is most often not for a lack of trying on our end, unfortunately!
Whereas there are also other brokers out there that are the complete opposite & realise the value it adds for their customers. Each one is different, and there is also no real way for us to code our way around the issue for those who don’t wish to do so either.
The blocker here is usually the shape of the export rather than anyone’s willingness to build the integration: an importer needs one row per transaction with date, units, price, gross amount, fee and currency, and a general-ledger report that only aggregates cash movements cannot be mapped back into individual buys and sells. If you are putting the request to InvestNow directly, that is the concrete ask - transaction-level confirmations or a per-trade CSV with those columns, not a monthly summary. PIE funds add a second problem, because reinvested distributions and tax credits are not trades and their unit prices often only exist on the manager’s own statement, so even a clean ledger export needs an agreed rule for those rows. It is also worth asking for a holdings snapshot with cost base, since a periodic reconciliation against registry and manager figures is workable even while trade-level data is unavailable.