Why Does My Google API Client Return 'invalid_grant' When Refreshing Tokens?

Failed to Refresh Token with Google API Client

Upon encountering access limitations when accessing different Google Analytics profiles with the same Google account, it becomes evident that the access token expires after an hour. To address this issue, the refresh token associated with the original token should be used to retrieve a new usable token. However, attempts to utilize the $client->refreshToken($refresh_token_key) method resulted in an "invalid_grant" error.

Upon examining the code, it was discovered that the refreshToken method expects the refresh key to be an object with specific fields, whereas the provided key was a simple string. The correct method usage is:

$client->refreshToken(json_decode($refresh_token_key, true));

This adjusts the parameters to match the expected format.

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