Twilio

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**Library - Feature**
- [PR 507](https://github.com/twilio/twilio-python/pull/507): add new max_retries param to TwilioHttpClient. Thanks to [msaelices](https://github.com/msaelices)!

**Authy**
- Added the `configuration` property to services to return the service level configurations
- Added optional parameter `Push` when creating a service to send the service level push factor configuration
- Remove FactorStrength support for Factors and Challenges **(breaking change)**

**Messaging**
- Correct the alpha sender capabilities property type **(breaking change)**

**Preview**
- Removed `/Devices` register Branded Calls endpoint, as per iOS sample app deprecation **(breaking change)**
- Removed `Twilio-Sandbox-Mode` request header from the Branded Calls endpoints, as not officially supported **(breaking change)**
- Removed `Verify` version from `preview` subdomain in favor to `verify` subdomain. **(breaking change)**

**Serverless**
- Add UI-Editable field to Services

**Supersim**
- Add `inactive` status for Super SIM which is an alias for `deactivated`

**Taskrouter**
- Adding value range to `priority` in task endpoint

**Verify**
- Fix `SendCodeAttempts` type. It's an array of objects instead of a unique object. **(breaking change)**

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**Api**
- Make call create parameters `async_amd`, `async_amd_status_callback`, and `async_amd_status_callback_method` public
- Add `trunk_sid` as an optional field to Call resource fetch/read responses
- Add property `queue_time` to successful response of create, fetch, and update requests for Call
- Add optional parameter `byoc` to conference participant create.

**Authy**
- Added support for challenges associated to push factors

**Flex**
- Adding `ui_dependencies` to Flex Configuration

**Messaging**
- Deprecate Session API **(breaking change)**

**Numbers**
- Add Regulations API

**Studio**
- Add Execution and Step endpoints to v2 API
- Add webhook_url to Flow response and add new /TestUsers endpoint to v2 API

**Taskrouter**
- Adding `longest_relative_task_age_in_queue` and `longest_relative_task_sid_in_queue` to TaskQueue Real Time Statistics API.
- Add `wait_duration_in_queue_until_accepted` aggregations to TaskQueues Cumulative Statistics endpoint
- Add TaskQueueEnteredDate property to Tasks.

**Video**
- [Composer] Clarification for the composition hooks creation documentation: one source is mandatory, either the `audio_sources` or the `video_layout`, but one of them has to be provided
- [Composer] `audio_sources` type on the composer HTTP POST command, changed from `sid[]` to `string[]` **(breaking change)**
- [Composer] Clarification for the composition creation documentation: one source is mandatory, either the `audio_sources` or the `video_layout`, but one of them has to be provided

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**Api**
- Making content retention and address retention public
- Update `status` enum for Messages to include 'partially_delivered'

**Authy**
- Added support for push factors

**Autopilot**
- Add one new property in Query i.e dialogue_sid

**Verify**
- Add `SendCodeAttempts` to create verification response.

**Video**
- Clarification in composition creation documentation: one source is mandatory, either `audio_sources` or `video_layout`, but on of them has to be provided

**Twiml**
- Add Polly Neural voices.

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**Library - Docs**
- [PR 504](https://github.com/twilio/twilio-python/pull/504): baseline all the templated markdown docs. Thanks to [childish-sambino](https://github.com/childish-sambino)!

**Api**
- Add payments public APIs
- Add optional parameter `byoc` to call create request.

**Flex**
- Updating a Flex Flow `creation_on_message` parameter documentation

**Preview**
-
- Removed Verify v2 from preview in favor of its own namespace as GA **(breaking change)**

**Studio**
- Flow definition type update from string to object

**Verify**
- Add `AppHash` parameter when creating a Verification.
- Add `DoNotShareWarningEnabled` parameter to the Service resource.

**Twiml**
- Add `track` attribute to siprec noun.
- Add attribute `byoc` to `<Number>`

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**Numbers**
- Add Regulatory Compliance CRUD APIs

**Studio**
- Add parameter validation for Studio v2 Flows API

**Twiml**
- Add support for `speech_model` to `Gather` verb

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**Preview**
- Add `/Insights/SuccessRate` endpoint for Businesses Branded Calls (Verified by Twilio)

**Studio**
- StudioV2 API in beta

**Verify**
- Add `MailerSid` property to Verify Service resource.

**Wireless**
- Added `data_limit_strategy` to Rate Plan resource.