Here's what people have said about working and interviewing at ISS Facility Services.
Wages are not paid at all waiting months for wages
No you will be terminated
There’s online pay slips but you don’t get told about it unless you ask. There are no paper pay slips, so the older people who work there with no internet access can’t check their wages so have no idea if they’re being paid correctly.
There is an online portal which you can access, however I had difficulties logging in. Go to the supervisor and they should be able to help. I don't think I ever actually received a wage slip.