* feat(fcm): Support `proxy` field in FCM `AndroidNotification`

* fix lint

* fix: Update `proxy` and `visibility` doc string with TW suggestion

…873)

Updated the 'Supported Python Versions' section in README.md to indicate that Python 3.7 and Python 3.8 support is deprecated, advising users to use Python 3.9 or higher.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

… tests (#881)

* Fix(tests): Use mock time for consistent token generation and verification tests

Patches time.time and google.auth.jwt._helpers.utcnow to use a fixed
timestamp (MOCK_CURRENT_TIME) throughout tests/test_token_gen.py.

This addresses test flakiness and inconsistencies by ensuring that:
1. Tokens and cookies are generated with predictable `iat` and `exp` claims
   based on MOCK_CURRENT_TIME.
2. The verification logic within the Firebase Admin SDK and the underlying
   google-auth library also uses MOCK_CURRENT_TIME.

Helper functions _get_id_token and _get_session_cookie were updated to
default to using MOCK_CURRENT_TIME for their internal time calculations,
simplifying test code.

Relevant fixtures and token definitions were updated to rely on these
new defaults and the fixed timestamp.

The setup_method in TestVerifyIdToken, TestVerifySessionCookie,
TestCertificateCaching, and TestCertificateFetchTimeout now mock
time.time and google.auth.jwt._helpers.utcnow to ensure that all
time-sensitive operations during testing use the MOCK_CURRENT_TIME.

* Fix(tests): Apply time mocking to test_tenant_mgt.py

Extends the time mocking strategy (using a fixed MOCK_CURRENT_TIME)
to tests in `tests/test_tenant_mgt.py` to ensure consistency with
changes previously made in `tests/test_token_gen.py`.

Specifically:
- Imported `MOCK_CURRENT_TIME` from `tests.test_token_gen`.
- Added `setup_method` (and `teardown_method`) to the
  `TestVerifyIdToken` and `TestCreateCustomToken` classes.
- These setup methods patch `time.time` and
  `google.auth.jwt._helpers.utcnow` to return `MOCK_CURRENT_TIME`
  (or its datetime equivalent).

This ensures that token generation (for custom tokens) and token
verification within `test_tenant_mgt.py` align with the mocked
timeline, preventing potential flakiness or failures due to
time inconsistencies. All tests in `test_tenant_mgt.py` pass
with these changes.

* fix lint and refactor

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

* Add live_activity_token to `APNSConfig`, allowing you to specify this token for APNS messages.

This change introduces:
- Adding the `live_activity_token` field to the `APNSConfig` class
- Updated unit test to verify that the `live_activity_token` is correctly included in the encoded message

* Refactor and edit doc string

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Co-authored-by: Lahiru Maramba <[email protected]>
Co-authored-by: Jonathan Edey <[email protected]>

…or FCM async and HTTP/2 support (#882)

* Added minimal support for sending FCM messages in async using HTTP/2 (#870)

* httpx async_send_each prototype

* Clean up code and lint

* fix: Add extra dependancy for http2

* fix: reset message batch limit to 500

* fix: Add new import to `setup.py`

* Refactored retry config into `_retry.py` and added support for exponential backoff and `Retry-After` header (#871)

* Refactored retry config to `_retry.py` and added support for backoff and Retry-After

* Added unit tests for `_retry.py`

* Updated unit tests for HTTPX request errors

* Address review comments

* Added `HttpxAsyncClient` wrapper for `httpx.AsyncClient` and support for `send_each_for_multicast_async()` (#878)

* Refactored retry config to `_retry.py` and added support for backoff and Retry-After

* Added unit tests for `_retry.py`

* Updated unit tests for HTTPX request errors

* Add HttpxAsyncClient to wrap httpx.AsyncClient

* Added forced refresh to google auth credential flow and fixed lint

* Added unit tests for `GoogleAuthCredentialFlow` and `HttpxAsyncClient`

* Removed duplicate export

* Added support for `send_each_for_multicast_async()` and updated doc string and type hints

* Remove duplicate auth class

* Cover auth request error case when `requests` request fails in HTTPX auth flow

* Update test for `send_each_for_multicast_async()`

* Address review comments

* fix lint and some types

* Address review comments and removed unused code

* Update metric header test logic for `TestHttpxAsyncClient`

* Add `send_each_for_multicast_async` to `__all__`

* Apply suggestions from TW review