When i use the PageSpeedInsight api, mostly i get an error like:
Quota exceeded for quota metric 'Queries' and limit 'Queries per minute' of service 'pagespeedonline.googleapis.com' for consumer 'project_number:583797351490'."
So i need to pass either oauth 2.0 or an API key.
On my app, i need to pass an API key because i dont want to login first, since this feature(PageSpeedInsight) can be freely accessed.

Problem:
Then, my problem is there is no 'key' parameter on PageSpeedInsight class. so, i cant pass the key.
Solution:
I manage to fix this, by adding a 'key' parameter after 'utm_source' parameter like this:
\ existing code
'utm_source' => [
'location' => 'query',
'type' => 'string',
],
\ I add this one:
'key' => [
'location' => 'query',
'type' => 'string',
],

Reason:
I request this because i think its not good editing on vendor folder (I use laravel).
it would be better if google add this then update the documentation about request parameter of this API.
so i dont need to edit anyhing on my vendor folder.