Hi all! Just wanted to add some additional information.
From the PayFlow Pro link I gave above, the PayFlow Pro Developer's Guide (PDF) is a very useful document for setting up your parameters for standard transactions.
However, for recurring billing, please select "Recurring Billing Service Guide for PayFlow Pro (PDF)." Here's an example of parameters for a recurring billing:
&TRXTYPE=R&ACTION=A&PROFILENAME=$(LastN), (FirstN)&AMT=250.00&TERM=0&START=$(StartDate)&PAYPERIOD=YEAR&OPTIONALTRX=A&EXPDATE=$(Expiration)&ACCT=$(CardNumber)&CVV2=$(CVSNumber)&FIRSTNAME=$(FirstN)&EMAIL=$(Email)&LASTNAME=$(LastN)&STREET=$(Street)&STATE=$(Region)&CITY=$(City)&ZIP=$(PostalCode)&COUNTRY=$(Country)&COMMENT1=$(Tele)
Thanks!
Candace