dev/core#1931 Prevent PayPal from double-encoding the IPN Notify URL 5.32 backport #18996
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Overview
Solves this issue on the Lab.
Backport of #18980
Before
PayPal IPN return URLs contain double-encoded entities, e.g.
After
PayPal IPN return URLs do not contain double-encoded entities, e.g.
Technical Details
When CiviCRM does not use Clean URLs (or, in WordPress, if a Shortcode is used for a Contribution Page) then IPN notifications fail to register contributions as "Completed". This applies to all CMSes where Clean URLs are not in use.