It has come to my attention that a possible problem has happened (again, not once but twice so far since I started using it) with WordPress’s Paywall/Donation system.
I have placed certain pieces of articles. mainly the Supplementary ones. behind a donation paywall. Some people who have donated to it have reported being unable to access what is behind the wall regardless. I cannot figure out the cause or the solution.
Therefore I have decided to remove all of the paywalls, as well as the content behind them, a week from this post to avoid further problems.
I shall be redirecting people to buy the ebook on Gumroad instead. It costs a bit more but it has more content/images.