No not using any new rpcs at the moment, we are syncing all payment data and storing in a local DB rather than using the node as a kind of server. We want a view of all payment data so that in future releases we can render charts and have accounting exports, profit loss statements etc without having to fetch from the node each time. It also allows us to do nice payment summaries for when you have multiple nodes (and in the future xpubs, custodial and exchange wallet data) and really show the sats flow across multiple wallets.