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PHP client
Usage

Account

$client->account()->get() reads the key's account: its plan, what the plan allows, and how much of today's allowance is gone. Each field is described in the API's account object.

PHP 
use Mozex\Iminify\Enums\Plan;

$account = $client->account()->get();

$account->plan === Plan::Pro;
$account->planEndsAt;                  // when a paid plan or a trial ends, null while it renews
$account->limits->imagesPerDay;
$account->limits->maxFileSize;
$account->usage->images->used;
$account->usage->images->remaining;
$account->usage->images->resetsAt;     // a rolling 24 hours from the first use

The usage has images, scans, crawls, altTexts and files, each a Usage.

A limit that reads null is unlimited, never zero. Some plans have no daily limit on images or page scans, so ask the Usage rather than comparing the number:

PHP 
if ($account->usage->images->isSpent()) {
    // nothing left until resetsAt
}

$account->usage->images->isUnlimited();

isSpent() is false on an unlimited plan, where remaining is null.