How do you deal with scenarios when the same user has 2 browser windows of the extension open?

[BarryCarlyon]

@Dist

For example if a sku is to get ‘gold tokens’, then the EBS can credit those ‘tokens’ to the users account and this can completely ignore any duplicate transactions as no meta-data or state needs to be sent from the user to your EBS

Well you still need to stop them getting gold tokens twice for a given transaction