exports.handler = function(context, event, callback) {

    let sync = Runtime.getSync();
    let payload = {
        'greeting': "bonbon!"
    };
    let uniqueName = "test4";

    sync.documents.create({
        uniqueName: uniqueName,
        ttl: 5, //////////////////DOESN'T WORK!!!
        data: payload
    }).then(function(response) {
        console.log(response);
        callback(null, response);
    });
}

{
_version: {
_domain: {
twilio: {
username: "xxxxxxxxxxxxxxxxxxxxxx",
password: "[Redacted]",
accountSid: "xxxxxxxxxxxxxxxxxxxxxx",
httpClient: { },
_sync: {
$ref: "$["_version"]["_domain"]"
}
},
baseUrl: "https://sync.twilio.com",
_v1: {
$ref: "$["_version"]"
}
},
_version: "v1"
},
sid: "xxxxxxxxxxxxxxxxxxxxxx",
uniqueName: "test4",
accountSid: "xxxxxxxxxxxxxxxxxxxxxx",
serviceSid: "xxxxxxxxxxxxxxxxxxxxxx",
url: "https://sync.twilio.com/v1/Services/xxxxxxxxxxxxxxxxxxxxxx/Documents/xxxxxxxxxxxxxxxxxxxxxx",
links: {
permissions: "https://sync.twilio.com/v1/Services/xxxxxxxxxxxxxxxxxxxxxx/Documents/xxxxxxxxxxxxxxxxxxxxxx/Permissions"
},
revision: "0",
data: {
greeting: "bonbon!"
},
dateCreated: "2018-09-19T03:30:24.000Z",
dateUpdated: "2018-09-19T03:30:24.000Z",
createdBy: "system",
_solution: {
serviceSid: "default",
sid: "xxxxxxxxxxxxxxxxxxxxxx"
}
}