Webhooks failing with Maximum Line Length Limit Exceeded

[josh-carter]

Describe the bug Webhooks were failing with an error "Maximum line length limit exceeded" within the Adyen dashboard under developers > webhooks > troubleshoot.

The issue turned out to be due to the length of the content-security-policy/content-security-policy-report-only response header body from the adyen/process/json request

Unclear as to whether the change that caused the problem was on the Adyen side or whether it's just come to light as the merchant in question had a large set of Content security policies.

This also seemed to only be affecting Klarna/PayPal orders.

To Reproduce Steps to reproduce the behavior: 1 - Setup a Magento/Adobe Commerce instance with a large set of content security policies 2 - Test Webhook from Adyen dasbhoard 3 - Get Maximum Line Length Limit Exceeded error message

Expected behavior No errors handling notification webhooks no matter on the size of the content-security-policy response headers

Magento version v2.4.5.-p1

Plugin version v8.3.2

Adyen Support Ticket - #3448958