how to add soap in CodeIgniter 4?

Using SoapClient is no different in CodeIgniter than it is using plain old PHP.
e.g. using SoapClient to load orders from Magento:

Code:

$client = new SoapClient($magento_server . "/index.php/api/v2_soap?wsdl=1");
$session = $client->login($magento_api_user, $magento_api_key);

$filters = array(
  'created_at' => array( '>' => $from_date),
  'created_at' => array( '<' => $to_date)
);

$orders = $client->salesOrderList($session, $filters);

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