Sage 300 API - AP Payment - updating payment batches

i am reviewing the Sage 300 web API and looking for a means of updating a  AP payment batch (eg. removing a cheque from the batch, updating cheque dates, removing invoices,etc...) and all I can see thus far is GET and POST for APPaymentAndAdjustmentBatches endpoint..  Does is that mean my only option is the use the COMAPI to do any updates to the AP payment batch?