* add ml api deprecation warnings

* Verify deprecation warnings in unit tests

* add helper function to prevent duplicate warning flooding and unit tests for it

…e#976)

* add one time token verification support

* add unit tests

* fix lint error

* change to use _utils.handle_platform_error_from_requests

* change the function description

* change docstring to state limited-use tokens

* add validation for consume variable

* add check_boolean to _Validators and add unit tests to check non-boolean consume

* raise `exceptions.UnknownError` if body is not a dict

* move the replay verification to a separate helper method and add unit tests

* add test_verify_token_with_consume_false_makes_no_http_call unit test

* replace the broad exceptions.FirebaseError assertion with more specific error types

* Refactor token verification tests to use mock_jwt fixture

* Document ValueError when consume is not a boolean in verify_token docstring

* feat(fcm): Migrate topic management to FCM v1 API

* fix(fcm): Prevent headers mutation race condition and deduplicate topic error parsing

- Pass a copy of self._fcm_headers in topic management requests to prevent concurrent mutation race conditions in ThreadPoolExecutor.
- Extract common error parsing logic from _build_topic_subscription_result_from_requests_error and _build_topic_subscription_result_from_httpx_error into _build_topic_subscription_result.

* fix(fcm): Improve topic management performance and fix test lint issues

- Hoist URL-encoded topic computation out of the per-token request loops.
- Mount an HTTPAdapter with a connection pool size of 100 on the FCM client session.
- Fix line length and method signature override lint warnings in test_messaging.py.

* fix(fcm): Addressed review improvements for FCM v1 topic management

- Added type annotations to public topic management functions and internal methods
- Updated HTTP status code mapping (401->UNAUTHENTICATED, 503->UNAVAILABLE, 408/504->DEADLINE_EXCEEDED) and prioritized status codes over free-form message strings
- Updated topic regex with \Z to reject trailing newlines
- Passed header copies in send, send_each, and send_each_async to prevent concurrency mutations
- Added test coverage for status code mapping, async argument validation, prefixed topics, and async batch unsubscribe

* chore(fcm): Trigger CI workflows

)

* fix(fac): Use v1beta endpoint for verifyAppCheckToken

Updated _AppCheckService._VERIFY_URL_FORMAT to point to the v1beta endpoint (https://firebaseappcheck.googleapis.com/v1beta/projects/{project_id}:verifyAppCheckToken) for replay protection verification.

* chore(fac): Fix line length lint in test_app_check.py

…meters (firebase#996)

* fix(auth): validate tenant and provider IDs and URL-encode query parameters

* fix(auth): simplify tenant and provider ID validation checks