Shockingly quite simple.

If you are obsessive over the look of your items then you can use the support guide to keep it looking pristine. Otherwise just use it like a normal credit card and understand that a white card is going to discolour over time.

All of my other credit cards are scratched up and look awful. If these other cards had instructions to keep them pristine, they would have similarly laughable requirements.

On a silk cushion, carried around by your servant?