addtocart_popup_image_size = 200

$imageSize = (int)$config->get('addtocart_popup_image_size', 50);
.....
if($imageSize > 0) {
$img = $imageHelper->getThumbnail($image_path, array($imageSize,$imageSize), array('default' => true), true);

protected function getAjaxCartData($data, $cart, $status) {
		
		$config = hikashop_config();
		$imageSize = (int)$config->get('addtocart_popup_image_size', 50);
		
		$ret = array(
			'ret' => (int)$status
		);
		if(!empty($cart->messages))
			$ret['messages'] = $cart->messages;

		if(empty($cart->cart_products))
			$ret['empty'] = true;

		if(!empty($data['type']) && $data['type'] == 'product' && !empty($data['form']) && count($data['form'])) {
			$added = array();
			foreach($data['form'] as $prod => $qty) {
				if($qty)
					$added[] = array('product' => $prod, 'quantity' => $qty);
			}

			if(count($added) == 1) {
				$data = array_merge($data,$added[0]);
			}
		}

		if(!isset($data['product']))
			return $ret;

		$imageHelper = hikashop_get('helper.image');
		if(!empty($cart->products)) {
			foreach($cart->products as $product) {
				if($product->product_id != $data['product'])
					continue;

				$ret['product_name'] = $product->product_name;
				$ret['quantity'] = (int)$product->cart_product_quantity;

				if($imageSize > 0) {
					$image_path = (isset($product->images[0]->file_path) ? $product->images[0]->file_path : '');
					$img = $imageHelper->getThumbnail($image_path, array($imageSize,$imageSize), array('default' => true), true);
					if($img->success)
						$ret['image'] = $img->url;
				}
				break;
			}
		}
		if(!isset($ret['product_name'])) {
			$productClass = hikashop_get('class.product');
			$product = $productClass->getProduct($data['product']);
			$ret['product_name'] = $product->product_name;
			$ret['quantity'] = 0;

			$image_path = ((isset($product->parent) && isset($product->parent->images[0]->file_path)) ? $product->parent->images[0]->file_path : '');
			$image_path = (isset($product->images[0]->file_path) ? $product->images[0]->file_path : $image_path);
			$img = $imageHelper->getThumbnail($image_path, array($imageSize,$imageSize), array('default' => true), true);
			if($img->success)
				$ret['image'] = $img->url;
		}

		if(!empty($cart->messages)) {
			foreach($cart->messages as $msg) {
				if(empty($msg['product_id']) || (int)$msg['product_id'] != $data['product'])
					continue;
				$ret['message'] = $msg['msg'];
				break;
			}
		}

		return $ret;
	}