You can specify your store currency by editing the currency settings under the e-shop setting. Click on Cogwheel Icon > E-Commerce > Settings > Payment > Currency. You can only select one currency for your store.
To help you choose a suitable currency, we have added a system message feature. When selecting a currency, you might see a system message that informs you if the selected currency is supported by the payment method or if decimals are allowed. Here are some examples: