On any list of the most exclusive credit cards, the Robinhood Platinum card would make an appearance. Its $695 annual fee and upscale perks put it on par with other premium credit cards on the market. As of this writing, though, the card isn’t open to general applications: Like its little sibling, the Robinhood Gold card , the Platinum is available by invitation only. And before you request your invite, you’ll want to take a good look at the Platinum’s laundry list of credits. The card very much follows the “coupon book” trend that was started by other premium cards, and using those benefits is key to offsetting the card's hefty fee. But like traditional coupons, these perks have expiration dates, exemptions, and eligibility requirements that can make the them more of a headache and less of a way to squeeze value from the card. Here are five things to know about the Robinhood Platinum card, issued by Coastal Community Bank. 1.…