/usr/share/dbus-1/services/com.canonical.Purchase.service is in ubuntu-purchase-service 14.04+14.04.20140310.2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=com.canonical.Purchase
Exec=/usr/lib/ubuntu-purchase-service/ubuntu-purchase-service
|