I had done this before just trying ti profile the overview instruction .. please check and inform if working or no ...
For google.
login to the dev console as mention in the manual.
https://console.developers.google.com/project
click on "create project"
type the name of the project and then click create
it will take 1 to 2 min to create the project .
once it is done it will show you a screen on the top it will show you "google api" next will be the name that you typed for the name of the project.
down below it will show you "Dashboard" " library" and "credentials"
Click on "Credentials"
on the credentials screen it will show you a pop up named API credentials.
Below on this pop up it will show " Create credentials " blue button and "DROP DOWN"
right next to it.
Click on the "DROP DOWN" AND seclect "OAUTH CLIENT ID"
On the next screen click on "Configure consent screen "
FYI : it will show you Web application adroid etc ON THIS PAGE but you will not be able to select it as it will be grayed out first configure the consent screen:
next screen fill in the details .
email id , product name , website url , privacy policy url,
then click save
then it will go to create client id
now show you "web application" ... now you should be able to select it. select it and fill the form below.
authorized java script oriigin as :
https://www.yoursitename.com
authroized redirect as :
https://www.yoursitename.com/google/oauth ( as mention in the oxwall manual )
now it it will show you the "client id and secret
copy and paste it in your google import page.
test
hope it helps .... if it works for you post it back.