Make compatible with PHP 7.4

Author: jissereitsma

DataLayer/Event/Purchase.php

@@ -55,7 +55,7 @@ public function get(): array
                 'tax' => $this->priceFormatter->format((float)$order->getTaxAmount()),
                 'shipping' => $this->priceFormatter->format((float)$order->getShippingAmount()),
                 'coupon' => $order->getCouponCode(),
-                'payment_method' => $order->getPayment()?->getMethod() ?? '',
+                'payment_method' => $order->getPayment() ? $order->getPayment()->getMethod() ? '',
                 'items' => $this->orderItems->setOrder($order)->get(),
             ]
         ];

DataLayer/Event/Refund.php

@@ -42,7 +42,7 @@ public function get(): array
                 'tax' => $this->priceFormatter->format((float)$order->getTaxAmount()),
                 'shipping' => $this->priceFormatter->format((float)$order->getShippingAmount()),
                 'coupon' => $order->getCouponCode(),
-                'payment_method' => $order->getPayment()?->getMethod() ?? '',
+                'payment_method' => $order->getPayment() ? $order->getPayment()->getMethod() ? '',
                 'items' => $this->orderItems->setOrder($order)->get(),
             ]
         ];

DataLayer/Mapper/OrderDataMapper.php

@@ -61,7 +61,7 @@ public function mapByOrder(OrderInterface $order): array
             'coupon' => $order->getCouponCode(),
             'date' => date("Y-m-d", strtotime($order->getCreatedAt())),
             'paymentType' => $this->getPaymentType($order),
-            'payment_method' => $order->getPayment()?->getMethod() ?? '',
+            'payment_method' => $order->getPayment() ? $order->getPayment()->getMethod() ? '',
             'customer' => $this->getCustomerData($order),
         ];
     }

DataLayer/Tag/Order/Order.php

@@ -47,7 +47,7 @@ public function merge(): array
             'affiliation' => $this->config->getStoreName(),
             'transaction_id' => $order->getIncrementId(),
             'coupon' => $order->getCouponCode(),
-            'payment_method' => $order->getPayment()?->getMethod() ?? '',
+            'payment_method' => $order->getPayment() ? $order->getPayment()->getMethod() ? ''
         ];
     }