Use this Scheduler to get the Tax rates every hour from the following API https://api.taxrates.io/index.html#method_getrates

Scheduler

<?php

function help() {
    echo <<<TEXT
Taxrates scheduler v1.0
Usage: 

php scheduler.php clientSecret command arg1 arg2 ...

php scheduler.php clientSecret rates [zip] [filter]
php scheduler.php clientSecret countrycode code product_code [zip] [filter]
php scheduler.php clientSecret ip ipaddr product_code [zip] [filter]

Examples:

php scheduler.php W0ARtUS52Dfwx3LnSy8 rates
php scheduler.php W0ARtUS52Dfwx3LnSy8 rates 10006
php scheduler.php W0ARtUS52Dfwx3LnSy8 rates 10006 standard

php scheduler.php W0ARtUS52Dfwx3LnSy8 countrycode DE C010 
php scheduler.php W0ARtUS52Dfwx3LnSy8 countrycode US C010 10006
php scheduler.php W0ARtUS52Dfwx3LnSy8 countrycode US C010 10006 standard

php scheduler.php W0ARtUS52Dfwx3LnSy8 ip 8.8.8.8 C010 
php scheduler.php W0ARtUS52Dfwx3LnSy8 ip 4.4.4.4 C010 10006
php scheduler.php W0ARtUS52Dfwx3LnSy8 ip 8.8.8.8 C010 10006 standard
TEXT;
}

if ($argc < ($argv[2] === 'rates' ? 3 : 4)) {
    help();
    return 1;
}

$curl = new class($argv[1])
{
    private $ch;

    public function __construct($clientSecret)
    {
        $this->ch = curl_init();
        curl_setopt($this->ch, CURLOPT_HEADER, 0);
        curl_setopt($this->ch, CURLOPT_FAILONERROR, false);
        curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
//        curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, false);
//        curl_setopt($this->ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($this->ch, CURLOPT_HTTPHEADER, [
            'Accept: application/json',
            'Authorization: Apikey ' . $clientSecret,
        ]);
    }

    public function __destruct()
    {
        curl_close($this->ch);
    }

    public function rates($zip = null, $filter = null)
    {
        $query = http_build_query(
            [
                'domain' => 'api.taxrates.io',
                'zip' => $zip,
                'filter' => $filter,
            ]
        );
        return $this->request('/api/v1/tax/rates?'.$query);
    }

    public function rates3($cursor = 0, $filter = false)
    {
        $query = http_build_query([
            'domain' => 'api.taxrates.io',
            'cursor' => $cursor,
            'filter' => $filter,
        ]);

        return $this->request('/api/v3/tax/rates?'.$query);
    }

    public function countryCode($countryCode, $productCode, $zip = null, $filter = null)
    {
        $query = http_build_query(
            [
                'domain' => 'api.taxrates.io',
                'country_code' => $countryCode,
                'zip' => $zip,
                'product_code' => $productCode,
                'filter' => $filter,
            ]
        );
        return $this->request('/api/v1/tax/countrycode?'.$query);
    }

    public function ip($ip, $productCode, $zip = null, $filter = null)
    {
        $query = http_build_query(
            [
                'domain' => 'api.taxrates.io',
                'ip' => $ip,
                'zip' => $zip,
                'product_code' => $productCode,
                'filter' => $filter,
            ]
        );
        return $this->request('/api/v1/tax/ip?'.$query);
    }

    private function request($url)
    {
        $headers = [];
//        $domain = 'http://api.stage.taxrates.io';
//        $domain = 'http://api.taxrates.local';
        $domain = 'https://api.taxrates.io';

        curl_setopt($this->ch, CURLOPT_URL, $domain.$url);
        curl_setopt($this->ch, CURLOPT_HEADERFUNCTION, function ($curl, $header) use(&$headers) {
            $len = strlen($header);
            $header = explode(':', $header, 2);
            if (count($header) < 2) { // Invalid header
                return $len;
            }
            $name = strtolower(trim($header[0]));
            if (!array_key_exists($name, $headers)) {
                $headers[$name] = [trim($header[1])];
            } else {
                $headers[$name][] = trim($header[1]);
            }
            return $len;
        });

        $result = curl_exec($this->ch);

        if ($result === false) {
            throw new RuntimeException(sprintf(
                'Curl: (%d) %s',
                curl_errno($this->ch),
                curl_error($this->ch)
            ));
        }

        if (curl_getinfo($this->ch, CURLINFO_RESPONSE_CODE) >= 400) {
            throw new RuntimeException($result);
        }

        $result = json_decode($result, true);
        if (!empty($result['ErrorCode'])) {
            throw new RuntimeException($result['ErrorMessage']);
        }

        return [
            'result' => $result,
            'headers' => $headers,
        ];
    }
};

try {
    $args = array_pad(array_slice($argv, 2, 5), 5, null);
    switch ($args[0]) {
        case 'rates':
            $response = $curl->rates($args[1], $args[2]);
            break;
        case 'countrycode':
            $response = $curl->countryCode($args[1], $args[2], $args[3], $args[4]);
            break;
        case 'ip':
            $response = $curl->ip($args[1], $args[2], $args[3], $args[4]);
            break;
        case 'rates3':
            $cursor = 0;
            while ($cursor !== null) {
                $response = $curl->rates3($cursor);
                $output = substr(json_encode($response['result']), 0, -1);
                if ($cursor !== 0) {
                    $output = ','.substr($output, 1);
                }
                fwrite(STDOUT, $output);
                sleep(5);
                $cursor = isset($response['headers']['x-cursor-next'][0]) ? $response['headers']['x-cursor-next'][0] : null;
            }
            fwrite(STDOUT, ']');
            return;
        default:
            help();
            return 1;
    }

    $output = json_encode($response['result'], JSON_PRETTY_PRINT);
    if ($args[0] === 'rates3') {
        fwrite(STDOUT, substr(substr($output, 0, -1).',', 1));
    } else {
        fwrite(STDOUT, $output);
    }
} catch (Exception $e) {
    fwrite(STDERR, $e->getMessage());
}