Khushboo

Release 9.4.0

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- #2528 - #2419 - #2555 - #2554 - #2559 - #2561

[ECP-9424]Upgrading to the latest library V20.2.0 For plugin V3

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## Summary There is an inconsistency in [setItemCategory()](https://github.com/Adyen/adyen-php-api-library/blob/03573f5507442120838717dfdd9b2c4c8fe9fa92/src/Adyen/Model/Checkout/LineItem.php#L597) method. It looks like it excepts null parameters but fails after the is_null() check in the method. This inconsistency has been fixed...

[ECP-9498] Implement `onError` callback for the Paypal.

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**Description** While abandoning the payment from Paypal, the order is not cancelled, it remains in Pending Payment state until we have the OFFER_CLOSED processed, blocking the inventory. This PR aims...

[ECP-9431] Handling Refund Delay and Order Cancellation Issues when using Giftcard + redirected Payment method

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**Description** When a customer places an order using a gift card in combination with any redirected payment method, an order is created which redeems the gift card balance, even if...

**Description** Reliability project requires an event handling mechanism since it is an asynchronous flow. On the data collection points, an event needs to be dispatched and an observer should catch...