What is your developer key in the youtube-videos script?

Hello,
I try to use this article https://www.sitepoint.com/displaying-youtube-videos-php/ to use the YouTube video on
My application laravel 5, but when I read it I found below:

// .env

APP_DEBUG = true

app_name = & # 39; Name of your application (optional) & # 39;
client_id = & # 39; Your customer ID & # 39;
client_secret = & # 39; Your client secret & # 39;
api_key = & # 39; Your developer key & # 39;

Code (marked):

I suppose that the client_id / client_secret parameters are the following:
https://imgur.com/a/9S7p7Rn
Is it so?

But I'm not sure what the last parameter is?





api_key = & # 39; Your developer key & # 39;

Code (marked):

Is it the value I need to get something in the Google Developer Console?
1) I tried to search the Google Developer Console and search the network, but I did not get it … Where can I get it?

2) If Google has support, where can I ask them and wait for an answer in my email?
SEMrush

Thank you!