I have set up access to a client to view their invoices creating a pdf file. Here's my problem.
Say one of my pdf's is named 156489.pdf
then I typed in the address bar 156490.pdf as you can see changing 89 to 90 then I'm able to see someone else's invoice and I need to prevent that.
I don't know anything about Secure Socket Layer (SSL) but what would you guys suggest for me to do.
I'm looking for the best possible way of doing this with the at most security with what we have.
Tony