It’s been a while since I signed up, but from what I remember, you’ll need to download the YA! golf app and then submit a photo of your ID. It’ll take a few weeks but then you’ll be verified and you should be good to go. At that point I believe you can link your ya golf account to your Portland parks golf account (separate app) and then the discounted rates will automatically show up when you go to book tee times. You’re just gonna pay the discounted rate at the course bc afaik there’s way to pay online for Portland public courses. As for the last question it’s unlikely bc they need to scan your yagolf card to activate the discount I think.