Let’s face it; processing credit cards can be expensive. Card threshold allows you to set a dollar limit to determine the payment options allowed. Any payment over the specified dollar amount will not allow your customer to pay by credit card for that transaction. Instead they will only have the option to pay by ACH (e-check).
By accepting more ACH payments, this will reduce your processing costs by avoiding interchange fees.
Leaving a blank value means you will accept credit card payments regardless of the amount.
To enable the card threshold option, please go to Settings>Credit Card Settings