Follow below steps to create find Google web client id and secret key :
Step 1: Go to Google Developers Console. If you have a Google account, login, else Create an Account.Step 2: On the dashboard, click on the Project dropdown menu.
Step 3: Select an existing Firebase project
Step 4: Click on Credentials.
Step 5 : Click on Edit icon in Web client in OAuth 2.0 Client IDsStep 6 : Here is your web client id and secret key copy it
Note : In the Authorized JavaScript origins field, Enter the URL - https://snappy.appypie.com
While in Authorized redirect URLs field : Enter the URL - https://snappy.appypie.com/app/googleclass
Step 7 : Now paste the copied web client id and secret key in their respective fields on creator software
Step 8 : Click on Library
Step 9 : Click on View all
Step 10 : Now you need to enable all the highlighted APIs, that is Google Classroom and Google Drive API.Here, we are showing you the process to enable Google Classroom, follow the same process for other keys
Step 11 : Click on Enable
Step 12 : Click on credentials
Step 13 : On the credentials page, click on Create Credentials.Step 14 : Click on OAuth client ID.
Step 15 : Click on Configure Consent Screen.
Step 16 : Select user type Internal
Step 17 : After selecting the user type, click on Create.
Step 18: Add required app information and developer contact information, then click on Save and Continue.
Step 19 : On the scopes screen, click on Add or Remove Option
Step 20: Here you can add Manually add scopes and click on Add to table
Note : Please enter these scopes in highlighted field
https://www.googleapis.com/auth/userinfo.email
https://www.googleapis.com/auth/userinfo.profile
openid
https://www.googleapis.com/auth/drive.readonly
https://www.googleapis.com/auth/drive.file
https://www.googleapis.com/auth/classroom.profile.emails
https://www.googleapis.com/auth/classroom.profile.photos
https://www.googleapis.com/auth/classroom.rosters
https://www.googleapis.com/auth/classroom.rosters.readonly
https://www.googleapis.com/auth/classroom.courses
https://www.googleapis.com/auth/classroom.courses.readonly
https://www.googleapis.com/auth/classroom.announcements
https://www.googleapis.com/auth/classroom.announcements.readonly
https://www.googleapis.com/auth/classroom.coursework.me
https://www.googleapis.com/auth/classroom.coursework.me.readonly
https://www.googleapis.com/auth/classroom.coursework.students
https://www.googleapis.com/auth/classroom.coursework.students.readonly
https://www.googleapis.com/auth/classroom.student-submissions.me.readonly
https://www.googleapis.com/auth/classroom.student-submissions.students.readonly
https://www.googleapis.com/auth/classroom.topics
https://www.googleapis.com/auth/classroom.topics.readonly
Step 21 : click on Save and Continue.
Step 22 : Check the OAuth consent screen and scopes summary, then click on Credentials.
Step 23 : On the credentials page, click on Create Credentials.Step 24 : Click on OAuth client ID.
Step 25 : Select the application type from the dropdown menu.
Step 26 : Select Android as the application type.Step 27 : Enter your package name and app's SHA-1 fingerprint.
Note : In Package name field enter com.app.packagename.For Package name follow this How to find package name?
In SHA-1 field enter this : 55:A4:8E:1A:17:A0:67:C7:FB:22:EF:B3:63:95:58:EA:C0:FC:31:3FStep 28 : Once you have provided the details, click on Create.