...
Level II fields - Include additional data with transactions to qualify for better interchange rates.
Billing Address - Add billing address fields and prefill them if applicable.
Customization - Set the styles and contents for the payment fields.
Card swipe popup - Add a popup to support collecting payment data using a compatible card reader.
Transaction Submit Button - Add a preconfigured submission button that makes it easy to build a payment page.
Zero Dollar Auth - Check the validity of a payment method or obtain authorization for a transaction without actually charging the customer's account.
Tokenization - Create card tokens for automatic and recurring payments.
ACH - Accept payments using a customer’s bank account information.
For definitions of the PayFields actions, including the transaction result callback functions, see the Developer Guide.
...
Level II Fields
PayFields provides Level II fields for merchants who use additional information to qualify for reduced interchange fees. The example below shows how to add the Level II/III fields and set their values:
...