protected function sendExpo(): ?array 	{ 		if ($this->notification->scheduled_at > now()) { 			return null; 		}  		$data = [ 			'title' => $this->notification->title, 			'body' => $this->notification->body, 			'sound' => 'default', 			'_displayInForeground' => true, 			'to' => $this->notification->getTargets(), 			'data' => json_encode($this->notification->resourceArray()), 		];  		$expo = new ExpoPushHandler; 		$expo = $expo->send($data);  		if (!isset($expo['data'][0]['id'])) { 			return null; 		}  		$this->notification->update([ 			'external_id' => $expo['data'][0]['id'], 			'completed_at' => formatTimestamp(), 		]);  		return $expo; 	}