/usr/share/app-install/desktop/pay-test-app:pay-test-app.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | [Desktop Entry]
X-AppInstall-Package=pay-test-app
X-AppInstall-Popcon=0
X-AppInstall-Section=universe
Name=Pay Test App
Comment=Used for testing pay service, nothing else
Exec=/usr/lib/i386-linux-gnu/pay-service/pay-test-app
Path=/usr/lib/i386-linux-gnu/pay-service
Type=Application
Icon=pay-test-app
X-Ubuntu-Single-Instance=true
X-Ubuntu-Touch=true
X-Ubuntu-Gettext-Domain=app-install-data
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