Follow below mentioned steps to get your Google Client ID and Secret Key:
Step 1 : Go to Google Developer portal
Step 2 : If you have a Google account, login, else Create an Account
Step 7 : Search for Google Play Android Developer API here. You can even scroll down to Mobile section.
Step 8 :Click on Google Play Android Developer API
Step 9 : Click on Enable to activate the key
Step 10: Click on Credentials
Step 11 : Click on Create Credentials
Step 12 : Click on OAuth client ID
Step 13 : Go to OAuth Consent Screen
Step 14 : Select User type Internal
Step 15 : Click on create
Step 16 : Enter Application Name and select User support email. Next, enter the Authorized Domain and Developer Email address. In the Authorized Domains field, enter the URL - appypie.com. Once done, click on Save and Continue.
Step 17 : Click on save and continue
Step 18 : Click on credentials
Step 19 : Click on Create credentials
Step 20 : Click on OAuth Client ID
Step 21 : Select Application Type by click on dropdown menu
Step 22 : Click on web application
Step 23 : Click on Add URI
Step 24 : Provide Authorized JavaScript Origins and Authorized Redirect URLs.In the Authorized JavaScript origins field, enter the URL - https://snappy.appypie.com and in Authorized redirect URLs field ,enter the URL - https://snappy.appypie.com/app/iap-token . Once done, click on Create to continue
Step 25 : Click on create
Step 26 : Here is your Client ID and Secret Key.Copy themStep 27 : Paste the copied keys in the respective fields on the creator software and click on connect.
Now to link your Google Cloud project :
Step 28 : Go to Google Play Console
Step 29 : If you have a Google Developer account, login, else Signup.
Step 30 : Click on Settings.
Step 31 : Click on API Access under Developer Account.
Step 32 : Select Link existing project or create new project.
Step 33 : Click on the Project dropdown menu.
Step 34 : Select the project to be linked.
Step 35 : Once you have selected the project, click on Link Project.
Step 36 : Here you will see the project has been linked. You can also unlink the project.