Pokémon GO/Shop

You can purchase items with PokéCoins from the Shop. If needed, you can also purchase PokéCoins with real-world currency. There's a shield icon in the top right that you click to collect the reward for holding Gyms.

Upgrades
You can continue upgrading item storage up to a maximum of 1,000 items. Pokémon storage can be upgraded to a maximum of 1,000 Pokémon.

PokéCoins
PokéCoins can be bought from the store for real-world currency. They can be purchased in the following increments:
 * 100 PokéCoins
 * 550 PokéCoins
 * 1,200 PokéCoins
 * 2,500 PokéCoins
 * 5,200 PokéCoins
 * 14,500 PokéCoins