Symfony version(s) affected

6.3

Description

The Postmark docs state "datetimes within webhook data will be in ISO 8601 format". They then proceed to use dates in samples containing fractions (like 2019-11-05T16:33:54.9070259Z). According to Wikipedia it's fine to use fractions of seconds.

The PostmarkPayloadConverter nevertheless only allows times to be specified without fractions. This causes all samples from their docs to fail when testing payloads locally.

How to reproduce

Use sample payload from Postmark docs to test a webhook locally.

Possible Solution

Either

1. don't validate dates or
2. allow fractions of seconds to be passed.

Additional Context