Is buying from the shop with in-game tokens different than using Meta credits?

It is! Thank you for your help :)

You might try listening to the code block onConsumptionStarted, if it fires then use the consumeItemForPlayer(player, sku, quantity)

Here my script attached to the shop guizmo :

class ShopScript extends hz.Component<typeof ShopScript> {
  static propsDefinition = {};

  start() {

    this.connectCodeBlockEvent(this.entity, CodeBlockEvents.OnItemConsumeComplete, (player, item, success) => {
      if (success) {
      console.log(`${player.name.get()} successfully consumed the item: ${item}`);
      if(item === "+1_knockback_multiplier_2dfd2123")
      {
        // Ajouter +1 knockback multiplier
        const knockbackMultiplier = this.world.persistentStorage.getPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.knockbackMultiplier);
        this.world.persistentStorage.setPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.knockbackMultiplier, knockbackMultiplier + 1);
        console.log(`Increased knockback multiplier for ${player.name.get()} to ${knockbackMultiplier + 1}`);
      }else if(item === "+1_recoil_multiplier_0ec76b29")
      {
        // Ajouter +1 recoil multiplier
        const recoilMultiplier = this.world.persistentStorage.getPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.recoilMultiplier);
        this.world.persistentStorage.setPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.recoilMultiplier, recoilMultiplier + 1);
        console.log(`Increased recoil multiplier for ${player.name.get()} to ${recoilMultiplier + 1}`);
      }else if(item === "+1_resistance_multiplier_6517be99"){
        // Ajouter +1 resistance multiplier
        const resistanceMultiplier = this.world.persistentStorage.getPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.resistanceMultiplier);
        this.world.persistentStorage.setPlayerVariable(player, PersistentVariables_Data.playerPersistentVariables.number.resistanceMultiplier, resistanceMultiplier + 1);
        console.log(`Increased resistance multiplier for ${player.name.get()} to ${resistanceMultiplier + 1}`);
      }  
    }
    });
  }

}

All items are set to auto-consume. It seems to work fine when purchasing with meta-credits, as the console output and PPV are updated. However, when purchasing with Flouz, there is no console output and the PPV does not update.

Yes that's what I'm talking about. Here is my property panel.

Flouz are the in-game tokens; the first item can be purchased with meta credits, but the second and third cannot.

You're talking about this right?

What does the Item settings in the property panel to the right look like for this item?