Official rule text
21.3 When an effect instructs a player to replenish commodities, that player takes the number of commodity tokens necessary so that the amount of commodities that player has equals the commodity value on their faction sheet. Then, those tokens are placed faceup in the commodity area of that player’s faction sheet.
View official source
Source: Living Rules Reference and FAQ - Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 21.3