Ichiban Kuji are making Kingdom Hearts character collection cards which will be on sale starting May 24, 2017. These cards can be purchased from their site for 150 yen (about $1.34 USD) and they will be selling the collections on different periods starting from May 24, 2017 until the last collection to be sold in August 31, 2017.
UPDATE 1: Another photo of the cards has been shown off by @naxkia on Twitter. View this photo with the other photos in the gallery above.
UPDATE 2: Ichiban Kuji have extended the sales period for their Kingdom Hearts card collection to September 22, 2017. Also, more prints have been added to the collection, featuring different characters from Kingdom Hearts. The pricing remains 150 yen (about $1.34) per print. You can view the new character cards in the gallery above.