How to get Log with Stackdriver Logging API - google-apps-script

Question

I'm developing a chatbot using Dialogflow and I need to get full conversation log from it.
I checked this page and I guessed it is able to achieve it by using Stackdriver Logging api.
I referred below page and I tried, however using this api, it occurs 403 error.
https://cloud.google.com/logging/docs/reference/v2/rest/v2/logs/list
Did I use this in a wrong way?
How can I resolve this problem?
This is the error message.
{
"error": {
"code": 403,
"message": "The request is missing a valid API key.",
"status": "PERMISSION_DENIED"
}
}
This is my code where calling the api.
I used Google Apps Script.
function getLogs() {
//XXXXXXXX is my project_id
var output = UrlFetchApp.fetch('https://logging.googleapis.com/v2/projects/XXXXXXXX/logs');
Logger.log(output)
}

Answer 1

I've resolved this way.
Add my api key to http request.
var options = {headers: {Authorization: "Bearer " + ScriptApp.getOAuthToken()}};
var logs = UrlFetchApp.fetch("https://logging.googleapis.com/v2/projects/XXXXXXXX/logs?key=my_api_key", options)
Add scope to appscript.json.
"oauthScopes": ["https://www.googleapis.com/auth/cloud-platform","https://www.googleapis.com/auth/script.external_request"]
Then I found logs.list methond is not appropriate for my goal so I need to change to v2.entries method.
function getLogs(){
var options = {
method: "post",
contentType: "application/json",
headers: {Authorization: 'Bearer ' + ScriptApp.getOAuthToken()},
payload: JSON.stringify({
resourceNames: ['projects/XXXXXXX'],
filter: "timestamp >= searchdate",
orderBy: "timestamp desc",
pageSize: 1,
}),
}
var logs = UrlFetchApp.fetch("https://logging.googleapis.com/v2/entries:list?key=my_api_key", options);
Logger.log(logs);
}