protected function get_paypal_order( $raw_custom ) {
		// We have the data in the correct format, so get the order.
		$custom = json_decode( $raw_custom );
		if ( $custom && is_object( $custom ) ) {
			$order_id  = $custom->order_id;
			$order_key = $custom->order_key;
		} else {
			// Nothing was found.
			WC_Gateway_Paypal::log( 'Order ID and key were not found in "custom".', 'error' );
			return false;
		}

		$order = wc_get_order( $order_id );

		if ( ! $order ) {
			// We have an invalid $order_id, probably because invoice_prefix has changed.
			$order_id = wc_get_order_id_by_order_key( $order_key );
			$order    = wc_get_order( $order_id );
		}

		if ( ! $order || ! hash_equals( $order->get_order_key(), $order_key ) ) {
			WC_Gateway_Paypal::log( 'Order Keys do not match.', 'error' );
			return false;
		}

		return $order;
	}