Blastengine.init('YOUR_USER_NAME', 'YOUR_API_KEY');

const transaction = Blastengine.transaction();

transaction.fromEmail = '[email protected]';
transaction.setTo('[email protected]');
transaction.subject = 'Test subject';
transaction.setText('Test body');
const res = transaction.send();
console.log(res);
// { delivery_id: 188 }

const file = DriveApp.getFileById('DRIVE_FILE_ID');
const response = UrlFetchApp.fetch('https://example.com/logo.jpg');

transaction.addAttachment(file.getBlob());
transaction.addAttachment(response.getBlob());

const res = transaction.send();
console.log(res);
// { delivery_id: 189 }

const bulk = Blastengine.bulk();

bulk.fromEmail = '[email protected]';
bulk.subject = 'Test subject';
bulk.setText('Text body with  __name__');
const res =  bulk.register();
console.log(res);
// { delivery_id: 189 }

bulk.setTo('[email protected]', {
	'name': 'User 1',
});
bulk.setTo('[email protected]', {
	'name': 'User 2',
});
bulk.update();

bulk.send();

bulk.delete();