[PostFinance] How to diagnose «An error has occurred; please try again later»?

Extensions PostFinance
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1

The full message:

An error has occurred; please try again later. If you are the owner or the integrator of this website, please log into the PostFinance back office to see the details of the error.

2

You can diagnose such failure by means of the PostFinance’s error log.

3

Unfortunately, PostFinance does not send a webhook notification about such failures, so check your PostFinance error log regularly!