You can use this sample file changing your credentials and the request URL.

<?php
$request = new SoapClient("http://magento.m2/index.php/soap/?wsdl&services=integrationAdminTokenServiceV1", array("soap_version" => SOAP_1_2));
$token = $request->integrationAdminTokenServiceV1CreateAdminAccessToken(array("username"=>"admin", "password"=>"GN2vKgfsszz43u"));
 
$opts = array(
            'http'=>array(
                'header' => 'Authorization: Bearer '.json_decode($token->result)
            )
        );
 
$wsdlUrl = 'http://magento.m2/soap/default?wsdl&services=directoryCurrencyInformationAcquirerV1';
 
$context = stream_context_create($opts);
$soapClient = new SoapClient($wsdlUrl, ['version' => SOAP_1_2, 'context' => $context]);
 
$soapResponse = $soapClient->__getFunctions();

You can use this sample file changing your credentials and the request URL.

<?php
$request = new SoapClient("http://magento.m2/index.php/soap/?wsdl&services=integrationAdminTokenServiceV1", array("soap_version" => SOAP_1_2));
$token = $request->integrationAdminTokenServiceV1CreateAdminAccessToken(array("username"=>"admin", "password"=>"GN2vKgfsszz43u"));
 
$opts = array(
    'http'=>array(
        'header' => 'Authorization: Bearer '.json_decode($token->result)
    )
);
 
$wsdlUrl = 'http://magento.m2/soap/default?wsdl&services=directoryCurrencyInformationAcquirerV1';
$context = stream_context_create($opts);
$soapClient = new SoapClient(
    $wsdlUrl, 
    array('version' => SOAP_1_2, 'context' => $context])
);
 
$soapResponse = $soapClient->__getFunctions();