You enroll and pay for each program separately — there is no combined checkout for multiple programs, and each program is activated on its own once its payment is verified.
How it works
Fees apply per payment
Each checkout is a separate transaction: if you pay a program in installments, the $2 handling fee applies to each installment, and gateways that charge a 6% processing fee (Wintopay, PayPal, Geoswift, Xendit) apply it per transaction — see Is there any application fee and how do I pay it? and How can I pay my tuition or fees? for the full fee rules.