Changing amounts during custom payment flow

Hi there!

We are trying to integrate custom payment method.
So we have

  1. CustomPaymentService like in samples
  2. Activity where customer approves transaction and able to add tips, tax, cost for delivery, etc

Question: what Poynt methods we should call to change transaction amounts?
We tried to change transactionAmounts inside transaction object and pass it to paymentServiceListener.onResponse(). This method successfully sends request to Poynt Cloud and swithes us to Poynt Payment Fragment but there shows only original amount without changes.
Also we tried to call paymentService.updateTransaction() with AdjustTransactionRequest but it doesn’t affect transaction