Array_key_exists on object in class-dibs-post-checkout.php:80

Getting the error:

[09-Jun-2021 22:26:48 UTC] PHP Fatal error:  Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, stdClass given in /public_html/wp-content/plugins/dibs-easy-for-woocommerce/classes/class-dibs-post-checkout.php:80
Stack trace:
#0 /public_html/wp-includes/class-wp-hook.php(294): DIBS_Post_Checkout->dibs_order_completed()
#1 /public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()
#2 /public_html/wp-includes/plugin.php(484): WP_Hook->do_action()

It’s an object and not an array, so these lines (starting on line 79): 

`// Error handling.
if ( null !== $request ) {
	if ( array_key_exists( 'chargeId', $request ) ) { // Payment success.
		// Translators: Nets Charge ID.
		$wc_order->add_order_note( sprintf( __( 'Payment charged in Nets Easy with charge ID %s', 'dibs-easy-for-woocommerce' ), $request->chargeId ) ); // phpcs:ignore

		update_post_meta( $order_id, '_dibs_charge_id', $request->chargeId ); // phpcs:ignore
	} elseif ( array_key_exists( 'errors', $request ) ) { // Response with errors.
		if ( array_key_exists( 'instance', $request->errors ) ) { // If return is empty.
			$message = $request->errors->instance[0];
		} elseif ( array_key_exists( 'amount', $request->errors ) ) { // If total amount is wrong.
			$message = $request->errors->amount[0];
		} else {
			$message = wp_json_encode( $request->errors );
		}

		$this->charge_failed( $wc_order, true, $message );

	} elseif ( array_key_exists( 'code', $request ) && '1001' === $request->code ) { // Set order as completed if order has already been charged.
		// @todo - set status to on hold if WC order total and Nets order total don't match.
		$wc_order->add_order_note( sprintf( __( 'Nets error message: %s', 'dibs-easy-for-woocommerce' ), $request->message ) ); // phpcs:ignore
	} else {
		$this->charge_failed( $wc_order );
	}
} else {
	$this->charge_failed( $wc_order );
}

… has to be replaced with this:

// Error handling.
if ( null !== $request ) {
	if ( isset( $request->chargeId ) ) { // Payment success.
		// Translators: Nets Charge ID.
		$wc_order->add_order_note( sprintf( __( 'Payment charged in Nets Easy with charge ID %s', 'dibs-easy-for-woocommerce' ), $request->chargeId ) ); // phpcs:ignore

		update_post_meta( $order_id, '_dibs_charge_id', $request->chargeId ); // phpcs:ignore
	} elseif ( isset( $request->errors ) ) { // Response with errors.
		if ( array_key_exists( 'instance', $request->errors ) ) { // If return is empty.
			$message = $request->errors->instance[0];
		} elseif ( array_key_exists( 'amount', $request->errors ) ) { // If total amount is wrong.
			$message = $request->errors->amount[0];
		} else {
			$message = wp_json_encode( $request->errors );
		}

		$this->charge_failed( $wc_order, true, $message );

	} elseif ( isset( $request->code ) && '1001' === $request->code ) { // Set order as completed if order has already been charged.
		// @todo - set status to on hold if WC order total and Nets order total don't match.
		$wc_order->add_order_note( sprintf( __( 'Nets error message: %s', 'dibs-easy-for-woocommerce' ), $request->message ) ); // phpcs:ignore
	} else {
		$this->charge_failed( $wc_order );
	}
} else {
	$this->charge_failed( $wc_order );
}

I’m not sure if $request->errors is an object or and array, so I’m not sure if they should be changed as well.