Gmail OAuth

1. Go to the Google Cloud Console

Go to Google Cloud Console
Sign in with your Google Account (the one associated with your app).

2. Create or select a project

If you don't have a project yet, click on "Create Project" and give it a name
If you already have a project, select it from the list.

3. Set up the OAuth consent screen

Go to "APIs and Services" > "OAuth Consent Screen".
Fill in the required information :
- Select the type of application (External or Internal depending on your case).
- Application Name(visible to users).
- Support email and administrative contact email.
- Allowed domains (add your domain, e.g. votresite.com or localhost for development).
- Privacy policy URL (if available).
- Save and proceed to the next step.

4. Since we are in Test mode, still in "API and Services" > "OAuth consent screen"

Go to Audiance(1)
Add users(2)
Enter the addresses that will have access to the app(3)
Then the list(4) will be displayed

NB : if you don't add the address, when you try to connect in cypht, you won't have access, google will return an error.

5. Create OAuth credentials

Go to "APIs and Services" > "Credentials"
Click on "Create credentials" > "OAuth client ID".
Choose the type of application: Web application.
Fill in the fields :
- Name (e.g. "My App - Gmail Authentication").
- Allowed redirect URI :
  - For development: http://localhost:3000/auth/google/callback (adjust the port according to your app).
  - For production: https://yourdomaine.com/auth/google/callback.
Click "Create".

6. Get your GMAIL_CLIENT_ID and GMAIL_CLIENT_SECRET

After creation, Google will display

ID client(1) (GMAIL_CLIENT_ID).
Client secret (2)(GMAIL_CLIENT_SECRET).

Once you already have your credentials, go to the ".env" file at the root of the cypht project, then look for "GMAIL_CLIENT_ID" where you will put the number 1 and "GMAIL_CLIENT_SECRET" where you will put the number 2.

Now your configuration is done.