Pre-pay Meter Gas card holder

If you are anything like me, then you are always loosing your gas card for the pre-pay meter. Ours always takes on a life of its own and can end up buried in one of several draws or cupboards.
I made this to stick on the inside of a cupboard door so that I can always find the card.
There is a centre support in the slot to aid printing, just cut it out when printed.