Why are my stacks saying they are deprecated?

Are you seeing something like this on your PaySnap page(s)?

If you said yes, then it means you are using older stacks that use logic that will soon be discontinued by the Stacks Plugin itself.  To fix this you will need to replace that stack with the current PaySnap 3 stack(s). You will need to setup the new stack from scratch, there is no way to import or upgrade an old stack to the new.