--- title: "Changes to Create an Application" method: POST path: "/Accounts/{AccountSid}/Applications" --- # Changes to Create an Application `POST /Accounts/{AccountSid}/Applications` > Every recorded change to this operation, newest first. ## Timeline Changed in 7 of 47 revisions. - **2026-05-12** `2916d5e3072e`: 2 breaking, 2 info - **2026-05-12** `5344c0c93a4c`: 1 breaking, 4 info - **2026-03-04** `2e516ba2383f`: 14 breaking - **2026-01-20** `dce1bcef69f0`: 1 info - **2026-01-19** `d5fbaaddfa3e`: 7 breaking, 3 warning, 2 info - **2026-01-15** `07f73f74a61d`: 1 breaking, 1 info - **2026-01-15** `3c88f14db21e`: 1 breaking, 1 warning, 12 info ## Changes - **2026-05-12** `2916d5e3072e`: 2 breaking, 2 info - the `account_sid` response's property type changed from `string` to no type, and format from `uuid` to no format for status `201` - the `sid` response's property type changed from `string` to no type, and format from `uuid` to no format for status `201` - added `#/components/schemas/uuid` to the `account_sid` response property `allOf` list for the response status `201` - added `#/components/schemas/uuid` to the `sid` response property `allOf` list for the response status `201` - **2026-05-12** `5344c0c93a4c`: 1 breaking, 4 info - added 'unevaluatedProperties' constraint to the request body - added 'unevaluatedProperties' constraint to the response body for the status `201` - added 'unevaluatedProperties' constraint to the response body for the status `400` - added 'unevaluatedProperties' constraint to the response body for the status `401` - added 'unevaluatedProperties' constraint to the response body for the status `422` - **2026-03-04** `2e516ba2383f`: 14 breaking - response property `message_status_callback` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_fallback_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_fallback_url` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_status_callback` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_status_callback_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `sms_url` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `status_callback` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `status_callback_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `voice_caller_id_lookup` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `voice_fallback_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `voice_fallback_url` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `voice_method` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - response property `voice_url` list-of-types was widened by adding types `null` to media type `application/json` of response `201` - **2026-01-20** `dce1bcef69f0`: 1 info - added the non-success response with the status `422` - **2026-01-19** `d5fbaaddfa3e`: 7 breaking, 3 warning, 2 info - the `SmsFallbackUrl` request property format changed from no format to `uri` - the `SmsStatusCallback` request property format changed from no format to `uri` - the `SmsUrl` request property format changed from no format to `uri` - the `StatusCallback` request property format changed from no format to `uri` - the `VoiceFallbackUrl` request property format changed from no format to `uri` - the `VoiceUrl` request property format changed from no format to `uri` - removed the success response with the status `200` - the `FriendlyName` request property's maxLength was set to `64` - removed the request property `MessageStatusCallback` - removed the request property `VoiceCallerIdLookup` - added the new optional request property `SmsStatusCallbackMethod` - added the success response with the status `201` - **2026-01-15** `07f73f74a61d`: 1 breaking, 1 info - removed the media type `application/json` from the request body - added the media type `application/x-www-form-urlencoded` to the request body - **2026-01-15** `3c88f14db21e`: 1 breaking, 1 warning, 12 info - removed the media type `application/x-www-form-urlencoded` from the request body - removed the optional property `staus_callback_method` from the response with the `200` status - added the media type `application/json` to the request body - added the non-success response with the status `400` - added the non-success response with the status `401` - added the optional property `status_callback_method` to the response with the `200` status - removed the `GET` enum value from the `sms_fallback_method` response property for the response status `200` - removed the `GET` enum value from the `sms_method` response property for the response status `200` - removed the `GET` enum value from the `voice_fallback_method` response property for the response status `200` - removed the `GET` enum value from the `voice_method` response property for the response status `200` - removed the `POST` enum value from the `sms_fallback_method` response property for the response status `200` - removed the `POST` enum value from the `sms_method` response property for the response status `200` - removed the `POST` enum value from the `voice_fallback_method` response property for the response status `200` - removed the `POST` enum value from the `voice_method` response property for the response status `200` --- [Operation](https://skmtc.dev/signalwire/apis/compatibility-api/docs/Accounts/:AccountSid/Applications/post.md) - [API](https://skmtc.dev/signalwire/apis/compatibility-api.md) - [Page](https://skmtc.dev/signalwire/apis/compatibility-api/changes/Accounts/:AccountSid/Applications/post)