It worked. Got my green skin :). Sorry, I am a noob when it comes to web3. This is what I did to make it work:
- Made sure I had some NEAR tokens in my wallet (fairly obvious I know... :D). It took a while until I got the tokens.
- As soon as I had the tokens I tried again to buy the skin, but it did not work. I came back a few hours later and then it worked.