No Credentials Configured
Gmail OAuth sender connections will not work until you upload credentials.json
How to Get Credentials
Google Cloud Console · ~5 minute setup
1
Go to APIs & Services → OAuth consent screen. Create or verify your app (External user type is fine).
2
Go to Credentials → Create Credentials → OAuth client ID. Select Web application.
3
Under Authorised redirect URIs, add
the production URI (and optionally the local one):
Production (required)
https://smartsendplus.online/oauth/callback
Local dev (optional)
http://localhost:8080/oauth/callback
4
Click Download JSON and upload that file here, or paste its contents.
5
Enable the Gmail API in APIs & Services → Library for your project.
Add OAuth App
Upload credentials.json from Google Cloud Console