Does Pixpa charge any commissions on orders?

Pixpa does not charge any setup fees, listing fees or transaction fees on the products or orders of your Pixpa Store.

You only need to pay Pixpa subscription fees (monthly or yearly) based on the plan that you have chosen.
See Pixpa pricing plans here.

So you will earn 100% of the revenue that you generate from your store minus the transaction fees charged by Paypal if you are accepting payments using Paypal. See Paypal’s terms and transaction fee details for this.