The Bangkok BTS Skytrain One-Day Pass is easy to use.
I booked to receive the card at Suvarnabhumi Airport. On the Traveloka website, the counter is at AIRPORTELs, Level B - Rail Link, so I couldn't find it. If you book at this airport, go to the Rail link area, on the left there is a food court and currency exchange, go straight to the end and you will see the LUGGAGE DELIVERY & LUGGAGE STORAGE counter on the right, which is the correct address to exchange the card.