I am not getting credential.json file

[kanwar124]

Instead of getting credential.json file I am getting client_secret.json I added that file in directory now the thing is that what extension should I import in wdio.conf.js file or any test file, cause when I execute the test case I am getting this error "browser.checkInbox is not a function" however I have already installed the service via bash this is from pakage.json" "wdio-gmail-service": "^1.0.4""

services: [
"gmail",
{
credentialsJsonPath: path.join(
process.cwd(),
"./client_secret"
),
tokenJsonPath: path.join(
process.cwd(),
"./client_secret"
),
intervalSec: 10,
timeoutSec: 60,
},
],