Some of our donors have reported that they were not able to update the amount or cancel their recurring subscription payment using the standard email receipt that gets sent from CiviCRM. I am using Paypal pro with CiviCRM 5.13.5. When I have tried it myself, I get the following error.
However, if a link is served with checksum for that user then I was able to use UPDATE, CANCEL links! How can I fix this problem, please? Thanks.
UPDATE: this is the url I get when I click the link
does it seem all parameters present in the URL?