Paladins, like many multiplayer online games anymore, offer microtransactions in-game through the Store. Currently in Closed Beta, items are limited but additional items may be added in the future. 

There are four tabs in the store.

Featured: Items currently featured by Hi-Rez. This currently includes the Founder's Packs but this item will likely be removed at launch. 

Chests: Players can purchase card chests with either Crystals or the Gold (in-game currency). Each chest contains 5 random cards. 

Change Name: Players can change their account name for a fee

Redeem Code: Players can redeem codes from this panel.

Players can also purchase store specific currency called Crystals with 'real money' from the Store interface. Prices may change without notice. 

Crystals price (as of 1-14-16)