The payment methods your guests see at booking checkout are controlled by the payment provider configured in your PMS, not by the website.
Why this happens. HomeRunner processes guest payments through whichever payment provider your PMS attaches to each listing. For Guesty accounts, this is typically GuestyPay. There is no setting on the website side that adds or removes payment methods.
What you can do. To ask about buy-now-pay-later options such as Klarna or Affirm, contact your PMS account rep and ask whether their payment processing supports them. As of August 2026, Guesty does not advertise buy-now-pay-later support.