This is a Go package for accessing data about an Opal card.
It is not anything particularly useful for users (yet); it is currently intended for programmers to use as a building block.
To get it,
go get github.com/dsymonds/opal
You will need to put auth information in $HOME/.opal that looks like
{"Username":"xxx","Password":"yyy"}
Don't forget to chmod 600 $HOME/.opal.
I plan to make it easier to pass to this package programmatically.
To do a quick test that will access your card information and print out its balance and recent transactions,
go test -v github.com/dsymonds/opal