The Payment tool allows you to record or collect payment using several methods:

Enter a 16 or 15 digit credit card number manually into a mobile form. The numeric digits are visible on the screen while the user enters them; however, once the user moves to a new field, each of the first 12 numeric digits (or 10 digits for AMEX cards) is replaced with an "X" to ensure that the full credit card number remains hidden. When the form is submitted, the full credit card number remains hidden. The credit card number also remains hidden when the form is converted to PDF, is sent to an email address via PDF, or is printed.
Use PROPAY. Read more about integrating with PROPAY.
Use Square.
Use MiPOS from BAC Credomatic. Read more about integrating with MiPOS.