Hello @Gareth-And-Wendy0,
Lovely to meet you and welcome to the Community Center. I hope you don't mind, I have made your question into a new topic here as I think it will get lost among the thread you originally posted it in. 🙂
In terms of your question, to add a payment method you can go to your Airbnb account > Payout Preferences on the left > Click Add Payout Method and enter your address to see the payout options available to you.
As different payment methods and curriencies differ by country, you will see the methods available in your area appear.
This Help Center article has more details on the different options, which may be helpful to you.
Also, are there any other hosts who might be able provide some more information on this?
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