I know, I know, this is not how I’m supposed to do it, but I can't think of something better.

README.md

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+## Mail client for the siteworx pro email API
+
+https://email.siteworxpro.com/api
+
+Access to the API is restricted and requires an account.
+
+`composer require siteworx/mail-client`
+
+**Requires** PHP >7.0
+
+Usage
+
+```php
+require 'vendor/autoload.php';
+
+$transport = new Siteworx\Mail\Transports\ApiTransport([
+	'client_id' => 'k4ndk...4kkfa',
+	'client_secret' => 'Jdv4...4kvD'
+]);
+
+$client = new Siteworx\Mail\Client($transport);
+
+$client->setSubject('Test Subject');
+$client->setFrom('from@email.com');
+
+$client->addTo('an@email.com');
+$client->addTo('another@email.com');
+
+$client->setBody('Test Message!');
+
+$result = $client->send();
+```
+
+You can provide a cache to the api transport and your api token will 
+automatically be cached for it's lifetime.
+
+```php
+
+$memcache = new Memcache;
+$memcache->addServer($host);
+
+$transport = new Siteworx\Mail\Transports\ApiTransport([
+	'client_id' => 'k4ndk...4kkfa',
+	'client_secret' => 'Jdv4...4kvD'
+]);
+
+$transport->setCache($memcache);
+```
+
+You can use any cache that implements the PSR-6 CacheInterface.
+
+**Catching Message**
+
+You can catch message if you are testing by passing in the value of `true` to the send method
+```php
+$client->send(true);
+```
+The payload will be sent to the api and validated but will be caught before it is sent.
+
+**Delaying Messages**
+
+You can delay message so they are sent at a specific time.
+
+```php
+$time = new DateTime();
+$time->add(new DateInterval('P1D'));
+$client->sendTime($time);
+```
+This will send the email the next day.