# What this PR does
Allow passing Google application credentials (used to send FCM messages
using `fcm-django`) as an environment variable
`GOOGLE_APPLICATION_CREDENTIALS_JSON_BASE64`. If the env variable is not
provided, credentials will be taken from file. This change allows uWSGI
workers send messages to FCM (currently it's not possible because the
uWSGI user doesn't have access to the credentials file) + makes
configuration more consistent.
Also removes a redundant `FCM_PROJECT_ID` env variable (Google
application credentials already contain the project ID).
## Which issue(s) this PR fixes
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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