Regarding Public View ACH Only Payments

Hi everyone.  I wanted to see if anyone has collected ACH payments only using the normal custom payment gateway interface and Public View in iMIS 15?
 

The selected vendor has a flexible API so writing the interface code is easy enough.  I assume I just modify pages to solicit the bank routing and account number values and just record the transaction number back to the payment object normally.  Not sure what if anything I do with the values, I don't think I need to store them.  If I have the vendors transaction ID that should be enough for iMIS to void it I think.

What am I missing as I think about this?  Any insight would be much appreciated.  Thanks!

JW Glass
BSCI