OAUTH: Figuring out where I went wrong ( step by step )

I am starting a new subject because I want to figure out where I am
going wrong with OAuth:

I just sat up a whole new project to figure this out... Here is step by
step screenshots of what I did:

1. https://imgur.com/a/2FHyNgC

2. https://imgur.com/a/9BU9QVc

3. https://imgur.com/a/xtFa7DL

4. https://imgur.com/a/7t5vIMl

This is just to show proof that GMAIL API was not an option until I
added it:

https://imgur.com/a/B1LdsF1

https://imgur.com/a/CJexIma

https://imgur.com/a/y4ME5dt



5. https://imgur.com/a/31GAJzk

6. https://imgur.com/a/MqR6M9d

7.https://imgur.com/a/9kypCJm

8. https://imgur.com/a/OMmjLtA

9. https://imgur.com/a/96fvDsx

10. https://imgur.com/a/zixSNvT

11. https://imgur.com/a/hj9qZIq

12. https://imgur.com/a/UeUqZYX


Chris