Website for buying PDF doesn't work

[chylex]

If I go to https://payhip.com/b/F0zkr#! and click "Buy Now!", nothing happens. If I click "Add to Cart", the button shows a loading icon and then nothing happens. Doesn't work even after disabling Firefox's Tracking Protection and uBlock Origin.

Browser console:

00:00:22.525 Navigated to https://payhip.com/b/F0zkr#!
00:00:23.549 This page uses the non standard property “zoom”. Consider using calc() in the relevant property values, or using “transform” along with “transform-origin: 0 0”. F0zkr
00:00:23.612 Cookie warnings 2
00:00:23.855 jQuery.Deferred exception: Cookies is not defined @https://payhip.com/b/F0zkr#! line 1 > injectedScript:11:9
l@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29375
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setTimeout handler*a/<@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29886
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fireWith@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:28202
fire@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:28238
u@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:27457
fireWith@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:28202
ready@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:31285
_@https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:31419
c@https://payhip.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js:1:9405
l@https://payhip.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js:1:1105
t.prototype.simulateStateAfterDeferScriptsActivation@https://payhip.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js:1:8630
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callback@https://payhip.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js:1:2851
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 undefined jquery.min.js:formatted:2035:16
00:00:23.856 Uncaught ReferenceError: Cookies is not defined
    <anonymous> F0zkr:11
    jQuery 10
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    l rocket-loader.min.js:1
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    callback rocket-loader.min.js:1
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    P rocket-loader.min.js:1
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F0zkr:11:9

[munificent]

It seems to be working for me now? I was able to repro this problem a while back. Maybe something was just temporarily broken on PayHip's end.

[chylex]

Still getting the same error, tried clearing browser caches but it didn't help :/