<input type="checkbox" name="provides[]" value="Outcall" [[+provides:FormItIsChecked=`Outcall`]]>

<div class="checkbox">
<label>
<input type="checkbox" name="provides[]" value="[[+provides]]">
Outcall
</label>
<label>
<input type="checkbox" name="provides[]" value="[[+provides]]">
Incall
</label>


<span class="error">[[!+fi.error.provides]]</span>
</div>

<div class="col-md-6 col-sm-12">
	        <label for="ticket-sections">Location</label>
	        <select name="parent" class="form-control" id="ticket-sections">[[+sections]]</select>
	        <span class="error"></span>
	    </div>

['rid:IN' => $rids]

Не пишите 'xml' большими буквами:

<?php

/**
 * @param $url
 * @return array
 */

function curlGet($url)
{

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');

    curl_setopt($ch, CURLOPT_ENCODING, 'gzip, deflate');

    $headers = array();
    $headers[] = 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9';
    $headers[] = 'Accept-Language: ru,en;q=0.9,ru-RU;q=0.8,en-US;q=0.7';
    $headers[] = 'Cache-Control: no-cache';
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

    $result = array('st' => 'OK', 'data' => curl_exec($ch));
    if (curl_errno($ch)) {
        $result['st'] = 'Error';
        $result['ErrorMsg'] = curl_error($ch);
    }
    curl_close($ch);
    return $result;
}

$xmlData = curlGet('http://www.cbr.ru/scripts/XML_daily.asp?date_req=25.08.2022');
var_dump($xmlData);