I've been trying for months and seeing many people with this problem. Today, after another frustrating session with the playstation support, I decided to try opening my playstation account in an incognito window via Chrome. In a regular browsing session, I was not able to open the payment methods link, it always ended up in An error has occurred. I fired the incognito window and logged to my playstation account, and LO AND BEHOLD!! I was able to add my paypal account to my payment methods!!! I went in to my console and verified in the account setting and Paypal was there!! Im sharing the knowledge, hope it helps you all!!
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