oAuth 1.0 + Magento 1.7 Doubts

I am trying to make a call to the REST API of Magento 1.7 (I use oAuth 1 for authentication).

In the example below from the website of my CRM ( link ) I access my store and make a request api, but asks me to authenticate my credentials:

Would it be possible to make this request api without asking me to authenticate the credentials in the browser? And put them in the php?

Thanks in advance

This is the example:

<?php
/**
* Example of simple product POST using Admin account via Magento REST API. OAuth authorization is used
*/
$callbackUrl = "http://micrm.host/oauth_customer.php";
$temporaryCredentialsRequestUrl = "http://tiendaonline.es/oauth/initiate?oauth_callback=" . urlencode($callbackUrl);
$adminAuthorizationUrl = 'http://tiendaonline.es/admin/oauth_authorize';
$accessTokenRequestUrl = 'http://tiendaonline.es/oauth/token';
$apiUrl = 'http://tiendaonline.es/api/rest';
$consumerKey = 'nz255xv0ob77egxyotme4dpoel486vqp';
$consumerSecret = '7ebvsendzw90xp5kr1tqzo5ewaf7bcci';

session_start();
if (!isset($_GET['oauth_token']) && isset($_SESSION['state']) && $_SESSION['state'] == 1) {
    $_SESSION['state'] = 0;
}
try {
    $authType = ($_SESSION['state'] == 2) ? OAUTH_AUTH_TYPE_AUTHORIZATION : OAUTH_AUTH_TYPE_URI;
    $oauthClient = new OAuth($consumerKey, $consumerSecret, OAUTH_SIG_METHOD_HMACSHA1, $authType);
    $oauthClient->enableDebug();

    if (!isset($_GET['oauth_token']) && !$_SESSION['state']) {
        $requestToken = $oauthClient->getRequestToken($temporaryCredentialsRequestUrl);
        $_SESSION['secret'] = $requestToken['oauth_token_secret'];
        $_SESSION['state'] = 1;
        header('Location: ' . $adminAuthorizationUrl . '?oauth_token=' . $requestToken['oauth_token']);
        exit;
    } else if ($_SESSION['state'] == 1) {
        $oauthClient->setToken($_GET['oauth_token'], $_SESSION['secret']);
        $accessToken = $oauthClient->getAccessToken($accessTokenRequestUrl);
        $_SESSION['state'] = 2;
        $_SESSION['token'] = $accessToken['oauth_token'];
        $_SESSION['secret'] = $accessToken['oauth_token_secret'];
        header('Location: ' . $callbackUrl);
        exit;
    } else {
        $oauthClient->setToken($_SESSION['token'], $_SESSION['secret']);
        $resourceUrl = "$apiUrl/products";
        $productData = json_encode(array(
            'type_id'           => 'simple',
            'attribute_set_id'  => 4,
            'sku'               => 'simple' . uniqid(),
            'weight'            => 1,
            'status'            => 1,
            'visibility'        => 4,
            'name'              => 'Simple Product',
            'description'       => 'Simple Description',
            'short_description' => 'Simple Short Description',
            'price'             => 99.95,
            'tax_class_id'      => 0,
        ));
        $headers = array('Content-Type' => 'application/json');
        $oauthClient->fetch($resourceUrl, $productData, OAUTH_HTTP_METHOD_POST, $headers);
        print_r($oauthClient->getLastResponseInfo());
    }
} catch (OAuthException $e) {
    print_r($e);
}