I have done these steps and I’m still getting a 403 forbidden from paypal. Here’s my address string in the browser looks a little different and I’m not able to make heads or tails of the code to paste into the little window.
https://northcountryfiberfair.org/shop/index.php/checkout/order-received/xxx?key=wc_order_xxx&utm_nooverride=1&tx=xxx&st=Completed&amt=0%2e01&cc=USD&cm=a%3a2%3a%7bi%3a0%3bi%3a1744%3bi%3a1%3bs%3a22%3a%22wc_order_xxx%22%3b%7d&item_number=