There are small fees for processing Invoice Payments.

Credit Cards are 3.75% + $0.25

ACH payments are: 0.5% capped at $5

In the Vinosmith Payments model the "payer pays" the fees. You as the Supplier / Merchant of Record, will receive the full invoice amount.

For example if you create an Invoice for $100 and the payer pays via ACH then they will pay $100.50 and you will receive the full invoice amount of $100.