The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From PayYourRent.com:
Pay rent on the go! With the PayYourRent application by PayYourRent.com, residents of supported properties can submit one-time payments or setup recurring payments by electronic check or credit card. The application also allows residents to view invoices and payment history as well as submit maintenance requests and view manager announcements from your iPhone, iPod touch, or iPad.
