google client php get inbox messages
$optParams = [];
$optParams['maxResults'] = 5; // Return Only 5 Messages
$optParams['labelIds'] = 'INBOX'; // Only show messages in Inbox
$messages = $service->users_messages->listUsersMessages('me',$optParams);
$list = $messages->getMessages();
$messageId = $list[0]->getId(); // Grab first Message
$optParamsGet = [];
$optParamsGet['format'] = 'full'; // Display message in payload
$message = $service->users_messages->get('me',$messageId,$optParamsGet);
$messagePayload = $message->getPayload();
$headers = $message->getPayload()->getHeaders();
$parts = $message->getPayload()->getParts();
$body = $parts[0]['body'];
$rawData = $body->data;
$sanitizedData = strtr($rawData,'-_', '+/');
$decodedMessage = base64_decode($sanitizedData);
var_dump($decodedMessage);