Entering organisation or event stripe "Payment Webhook signing secret" may not override system value.

[doug86i]

As discussed here: https://groups.google.com/g/alfio/c/86rGnLOuhfU

Having a system wide stripe config works as expected.

Trying to override the system stripe settings for an individual event or organisation results in the webhook failing with the following error in the log:

[ERROR] 2021-06-30 18:39:17.320 [qtp494894055-20] StripeWebhookPaymentManager - got exception while handling stripe webhook

com.stripe.exception.SignatureVerificationException: No signatures found matching the expected signature for payload

Suspected that the system signing secret is still used with the overridden API keys.

[cbellone]

fixed and released as part of https://github.com/alfio-event/alf.io/releases/tag/2.0-M3-2107