• There are still some parts of the code in the version 0.9.9.9.1 that have not been correctly updated for Woocommerce 3, 4 and LATER. From version 3 of Woocommerce all accesses to properties of things like order should use function calls and not access the properties directly.

    One example that generates a deprecation warning is $order->order_key on line 236 in class/wc-etransactions-abstract-gateway.php

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