Yes. As a Fernwayer affiliate, you take part as an independent contractor, not an employee. That means you're responsible for any taxes owed on your commission.
What this means
Fernwayer doesn't withhold taxes from your commission payments. The full commission is paid to you, and it's up to you to declare and pay whatever taxes apply where you live.
Tax rules vary from country to country, and from person to person, so how this works depends on your own situation and where you're based. If you're unsure what you owe or how to report it, a local tax professional is the best person to help.
Records you may need
Your Stripe Express account keeps a record of your payments, and you can download your payment history there whenever you need it — for your own records, or for filing your taxes.