Method not found. error when using Google my business API - php

Question

I am getting 404 from accouts list function by using google api client.
I have already access token by using OAuth2.0.
In addition to this, I already enable the Google My Business API via https://console.developers.google.com for OAuth 2.0.
■Here is environemnt
PHP 7.2.3
Ubuntu 18.04 LTS
google/apiclient ^2.5
The function I want to execute is as following.
https://developers.google.com/my-business/reference/rest/v4/accounts/list
I install google client libray by using composer from following link.
https://github.com/googleapis/google-api-php-client
Since google my business library is seprated, I use this program.
https://developers.google.com/my-business/samples
The steps to produce 404 is...
$client = new \Google_Client();
$client->setApplicationName("post_dev"); // app name
$client->setApprovalPrompt('force');
$client->setAccessType('offline');
$client->setAccessToken($credential);
$client->addScope("https://www.googleapis.com/auth/business.manage");
$client->addScope("https://www.googleapis.com/auth/plus.business.manage");
$gmbService = new \Google_Service_MyBusiness($client);
$results = $gmbService->accounts->listAccounts();
The variable $credential has following values.
client_id
client_secret
access_token
expires_in
refresh_token
After executing program, I am getting 404 erros like follwoing.
Google_Service_Exception[
404
]: {
"error": {
"code": 404,
"message": "Method not found.",
"errors": [
{
"message": "Method not found.",
"domain": "global",
"reason": "notFound"
}
],
"status": "NOT_FOUND"
}
}

Answer 1

It happens because you are trying to interact with the Google My Business API using a non-whitelisted project.
I faced the same issue. In my case, I submitted my project for whitelisting to unlock Google My Business API library.
Then, a couple weeks after that I created a new project under the same Google Cloud Platform account, just to set a more appropriate name. HERE was the root of the issue!
Even if you see the GMB library enabled at the account level, it works only at the PROJECT level. That's why you are getting 404 errors.
So, I switched everything to my original project (Consent screen settings, Oauth clients, etc)... The same on my localhost application, developed with Laravel Lumen 7.
After these couple changes, everything worked fine!
NOTE: Google allows you to whitelist 1 project per account ONLY! If your project/application were approved by Google, USE IT! Instead creating new ones.

Answer 2

This error has nothing to do with your access token. It cant find the method you are using. Google_Service_MyBusiness is not part of the Google api php client library.
The my Business API is unlike the other apis, it is not listed in the API directory available through the Discovery API and it requires a developer key and project acceptance into My Business. There for it cant be generated when the library generation script runs.
Im going though some channels to get that documentation page updated.
note from team Nov 1, 2018
There is a tool on the way that will help developers maintain their own version of such service classes. When it is ready and you have a project with My Business enabled you should be able to run:
export API_KEY=yourkey
bin/generate 'https://mybusiness.googleapis.com/$discovery/rest?version=v4&key=$API_KEY' generated-output
and then you can move the contents of generated-output/mybusiness-v4 anywhere you want in your include path.
That discovery URL has been known to change as new versions come out so keep and eye on https://developers.google.com/my-business/reference/rest/
Im waiting to hear the status of this.

Answer 3

The reason why I could not call the API is "my company already has a whitelisted project to access the Google My Business API. At this time, they are only whitelisting one project per business.". Therefore, I could not call API.

Answer 4

So far I'm able to use the PHP Library here - https://developers.google.com/my-business/samples/previousVersions
But the answer above was a huge help - I had EXACTLY the same issue, had "tidied up" my projects - after being granted access to the Google My Business API and seeing it available for my other projects I assumed incorrectly that my other projects would be able to use it - wrong! Very glad I found the answer here. Luckily I was able to restore the project I'd deleted, and using that one it worked straight away.