OpenCart 🇺🇦

$varData = array();

$variants           = $this->model_openstock_openstock->getProductOptionStocks($product_id);
$groups             = $this->model_catalog_product->getProductOptions($product_id);

$varData['groups']  = array();
$varData['related'] = array();

foreach($groups as $grp) {
	$t_tmp = array();
	foreach($grp['option_value'] as $grp_node) {
		$t_tmp[$grp_node['option_value_id']] = $grp_node['name'];

		$varData['related'][$grp_node['product_option_value_id']] = $grp['name'];
	}

	$varData['groups'][] = array('name' => $grp['name'], 'child' => $t_tmp);
}

$v = 0;

foreach($variants as $option) {
	if($v == 0) {
		//create a php version of the option element array to use on server side
		$varData['option_list'] = base64_encode(serialize($option['opts']));
	}

	$varData['opt'][$v]['sku']     = $option['var'];
	$varData['opt'][$v]['qty']     = $option['stock'];
	$varData['opt'][$v]['price']   = number_format($option['price'], 2);

	$varData['opt'][$v]['active']  = 0;
	if($option['active'] == 1) {  $varData['opt'][$v]['active'] = 1; }

	$v++;
}

$varData['groups']  = base64_encode(serialize($varData['groups']));
$varData['related'] = base64_encode(serialize($varData['related']));
$varData['id']      = $item_id;

//send to the api to process
$this->openbay->ebay->callNoResponse('item/reviseVariants', $varData);