SparkPost\Transmission::post PHP Method

post() public method

Send post request to transmission endpoint after formatting cc, bcc, and expanding the shorthand emails.
public post ( $payload = [], $headers = [] ) : SparkPostPromise
return SparkPostPromise or SparkPostResponse depending on sync or async request
    public function post($payload = [], $headers = [])
    {
        if (isset($payload['recipients']) && !isset($payload['recipients']['list_id'])) {
            $payload = $this->formatPayload($payload);
        }
        return parent::post($payload, $headers);
    }