OpenCart 🇺🇦

$this->language->load('checkout/cart');

$json = array();	

if (!$this->cart->hasProducts()) {
	$json['error']['warning'] = $this->language->get('error_product');				
}				

if (!$this->cart->hasShipping()) {
	$json['error']['warning'] = sprintf($this->language->get('error_no_shipping'), $this->url->link('information/contact'));				
}				

if ($this->request->post['country_id'] == '') {
	$json['error']['country'] = $this->language->get('error_country');
}

if (!isset($this->request->post['zone_id']) || $this->request->post['zone_id'] == '') {
	$json['error']['zone'] = $this->language->get('error_zone');
}

$this->load->model('localisation/country');

$country_info = $this->model_localisation_country->getCountry($this->request->post['country_id']);

if ($country_info && $country_info['postcode_required'] && (utf8_strlen($this->request->post['postcode']) < 2) || (utf8_strlen($this->request->post['postcode']) > 10)) {
	$json['error']['postcode'] = $this->language->get('error_postcode');
}

if (!$json) {		
	$this->tax->setShippingAddress($this->request->post['country_id'], $this->request->post['zone_id']);

	// Default Shipping Address
	$this->session->data['shipping_country_id'] = $this->request->post['country_id'];
	$this->session->data['shipping_zone_id'] = $this->request->post['zone_id'];
	$this->session->data['shipping_postcode'] = $this->request->post['postcode'];

	if ($country_info) {
		$country = $country_info['name'];
		$iso_code_2 = $country_info['iso_code_2'];
		$iso_code_3 = $country_info['iso_code_3'];
		$address_format = $country_info['address_format'];
	} else {
		$country = '';
		$iso_code_2 = '';
		$iso_code_3 = '';	
		$address_format = '';
	}

	$this->load->model('localisation/zone');

	$zone_info = $this->model_localisation_zone->getZone($this->request->post['zone_id']);

	if ($zone_info) {
		$zone = $zone_info['name'];
		$zone_code = $zone_info['code'];
	} else {
		$zone = '';
		$zone_code = '';
	}	

	$address_data = array(
		'firstname'      => '',
		'lastname'       => '',
		'company'        => '',
		'address_1'      => '',
		'address_2'      => '',
		'postcode'       => $this->request->post['postcode'],
		'city'           => '',
		'zone_id'        => $this->request->post['zone_id'],
		'zone'           => $zone,
		'zone_code'      => $zone_code,
		'country_id'     => $this->request->post['country_id'],
		'country'        => $country,	
		'iso_code_2'     => $iso_code_2,
		'iso_code_3'     => $iso_code_3,
		'address_format' => $address_format
	);

	$quote_data = array();

	$this->load->model('setting/extension');

	$results = $this->model_setting_extension->getExtensions('shipping');

	foreach ($results as $result) {
		if ($this->config->get($result['code'] . '_status')) {
			$this->load->model('shipping/' . $result['code']);

			$quote = $this->{'model_shipping_' . $result['code']}->getQuote($address_data); 

			if ($quote) {
				$quote_data[$result['code']] = array( 
					'title'      => $quote['title'],
					'quote'      => $quote['quote'], 
					'sort_order' => $quote['sort_order'],
					'error'      => $quote['error']
				);
			}
		}
	}

	$sort_order = array();

	foreach ($quote_data as $key => $value) {
		$sort_order[$key] = $value['sort_order'];
	}

	array_multisort($sort_order, SORT_ASC, $quote_data);

	$this->session->data['shipping_methods'] = $quote_data;

	if ($this->session->data['shipping_methods']) {
		$json['shipping_method'] = $this->session->data['shipping_methods']; 
	} else {
		$json['error']['warning'] = sprintf($this->language->get('error_no_shipping'), $this->url->link('information/contact'));
	}				
}	

$this->response->setOutput(json_encode($json));