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Add an \Adyen\ConnectionException catch in case the curl request failed (if the live endPoint is misconfigured)
Description
If the Live endPoint is misconfigured in the Magento2 module Backoffice, on the checkout page the CURL request to retrieve Adyen Payment raise an \Adyen\ConnectionException, but the getPaymentMethodsResponse in Helper/PaymentMethods.php is only catching \Adyen\AdyenException => so the Ajax call never return response and the checkout freeze when getting payment method.
Tested scenarios
Fixed issue: add an \Adyen\ConnectionException catch to handle failed CURL request