# Flow Revision

**Flows Revisions** track every change made to a [Flow](/docs/studio/rest-api/v2/flow) resource. Revisions are automatically created when a Flow is created or updated. Each revision is read-only and immutable (cannot be updated or deleted).

For convenience, the latest Revision and latest published Revision can be fetched using the magic identifiers `LatestPublished` and `LatestRevision` in place of an integer.

Fetching the parent [Flow](/docs/studio/rest-api/v2/flow) resource will always return the latest Flow Revision.

## Revision Properties

```json
{"type":"object","refName":"studio.v2.flow.flow_revision","modelName":"studio_v2_flow_flow_revision","properties":{"sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^FW[0-9a-fA-F]{32}$","nullable":true,"description":"The unique string that we created to identify the Flow resource."},"account_sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^AC[0-9a-fA-F]{32}$","nullable":true,"description":"The SID of the [Account](/docs/iam/api/account) that created the Flow resource."},"author_sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^US[0-9a-fA-F]{32}$","nullable":true,"description":"The SID of the User that created or last updated the Flow."},"friendly_name":{"type":"string","nullable":true,"description":"The string that you assigned to describe the Flow."},"definition":{"nullable":true,"description":"JSON representation of flow definition."},"status":{"type":"string","enum":["draft","published"],"description":"The status of the Flow. Can be: `draft` or `published`.","refName":"flow_revision_enum_status","modelName":"flow_revision_enum_status"},"revision":{"type":"integer","default":0,"description":"The latest revision number of the Flow's definition."},"commit_message":{"type":"string","nullable":true,"description":"Description of change made in the revision."},"valid":{"type":"boolean","nullable":true,"description":"Boolean if the flow definition is valid."},"errors":{"type":"array","nullable":true,"description":"List of error in the flow definition."},"date_created":{"type":"string","format":"date-time","nullable":true,"description":"The date and time in GMT when the resource was created specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format."},"date_updated":{"type":"string","format":"date-time","nullable":true,"description":"The date and time in GMT when the resource was last updated specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format."},"url":{"type":"string","format":"uri","nullable":true,"description":"The absolute URL of the resource."}}}
```

## Fetch a FlowRevision resource

`GET https://studio.twilio.com/v2/Flows/{Sid}/Revisions/{Revision}`

### Path parameters

```json
[{"name":"Sid","in":"path","description":"The SID of the Flow resource to fetch.","schema":{"type":"string","minLength":34,"maxLength":34,"pattern":"^FW[0-9a-fA-F]{32}$"},"required":true},{"name":"Revision","in":"path","description":"Specific Revision number or can be `LatestPublished` and `LatestRevision`.","schema":{"type":"string"},"required":true}]
```

Fetch Flow Revision

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function fetchFlowRevision() {
  const revision = await client.studio.v2
    .flows("FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
    .revisions("1")
    .fetch();

  console.log(revision.sid);
}

fetchFlowRevision();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

revision = (
    client.studio.v2.flows("FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
    .revisions("1")
    .fetch()
)

print(revision.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Studio.V2.Flow;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var flowRevision = await FlowRevisionResource.FetchAsync(
            pathSid: "FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", pathRevision: "1");

        Console.WriteLine(flowRevision.Sid);
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.studio.v2.flow.FlowRevision;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        FlowRevision flowRevision = FlowRevision.fetcher("FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "1").fetch();

        System.out.println(flowRevision.getSid());
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	resp, err := client.StudioV2.FetchFlowRevision("FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
		"1")
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		if resp.Sid != nil {
			fmt.Println(*resp.Sid)
		} else {
			fmt.Println(resp.Sid)
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$revision = $twilio->studio->v2
    ->flows("FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
    ->revisions("1")
    ->fetch();

print $revision->sid;
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

revision = @client
           .studio
           .v2
           .flows('FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
           .revisions('1')
           .fetch

puts revision.sid
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:studio:v2:flows:revisions:fetch \
   --sid FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX \
   --revision 1
```

```bash
curl -X GET "https://studio.twilio.com/v2/Flows/FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Revisions/1" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "sid": "FWXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
  "account_sid": "ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "author_sid": "USaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "definition": {
    "initial_state": "Trigger"
  },
  "friendly_name": "Test Flow",
  "status": "published",
  "revision": "1",
  "commit_message": null,
  "valid": true,
  "errors": [],
  "date_created": "2017-11-06T12:00:00Z",
  "date_updated": null,
  "url": "https://studio.twilio.com/v2/Flows/FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Revisions/1"
}
```

## Read multiple FlowRevision resources

`GET https://studio.twilio.com/v2/Flows/{Sid}/Revisions`

### Path parameters

```json
[{"name":"Sid","in":"path","description":"The SID of the Flow resource to fetch.","schema":{"type":"string","minLength":34,"maxLength":34,"pattern":"^FW[0-9a-fA-F]{32}$"},"required":true}]
```

### Query parameters

```json
[{"name":"PageSize","in":"query","description":"How many resources to return in each list page. The default is 50, and the maximum is 1000.","schema":{"type":"integer","format":"int64","minimum":1,"maximum":1000}},{"name":"Page","in":"query","description":"The page index. This value is simply for client state.","schema":{"type":"integer","minimum":0}},{"name":"PageToken","in":"query","description":"The page token. This is provided by the API.","schema":{"type":"string"}}]
```

Read Flow Revisions

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function listFlowRevision() {
  const revisions = await client.studio.v2
    .flows("FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .revisions.list({ limit: 20 });

  revisions.forEach((r) => console.log(r.sid));
}

listFlowRevision();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

revisions = client.studio.v2.flows(
    "FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
).revisions.list(limit=20)

for record in revisions:
    print(record.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Studio.V2.Flow;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var flowRevisions = await FlowRevisionResource.ReadAsync(
            pathSid: "FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", limit: 20);

        foreach (var record in flowRevisions) {
            Console.WriteLine(record.Sid);
        }
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.studio.v2.flow.FlowRevision;
import com.twilio.base.ResourceSet;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        ResourceSet<FlowRevision> flowRevisions =
            FlowRevision.reader("FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").limit(20).read();

        for (FlowRevision record : flowRevisions) {
            System.out.println(record.getSid());
        }
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	studio "github.com/twilio/twilio-go/rest/studio/v2"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	params := &studio.ListFlowRevisionParams{}
	params.SetLimit(20)

	resp, err := client.StudioV2.ListFlowRevision("FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
		params)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		for record := range resp {
			if resp[record].Sid != nil {
				fmt.Println(*resp[record].Sid)
			} else {
				fmt.Println(resp[record].Sid)
			}
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$revisions = $twilio->studio->v2
    ->flows("FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    ->revisions->read(20);

foreach ($revisions as $record) {
    print $record->sid;
}
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

revisions = @client
            .studio
            .v2
            .flows('FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
            .revisions
            .list(limit: 20)

revisions.each do |record|
   puts record.sid
end
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:studio:v2:flows:revisions:list \
   --sid FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
```

```bash
curl -X GET "https://studio.twilio.com/v2/Flows/FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Revisions?PageSize=20" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "meta": {
    "previous_page_url": null,
    "next_page_url": null,
    "url": "https://studio.twilio.com/v2/Flows/FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Revisions?PageSize=50&Page=0",
    "page": 0,
    "first_page_url": "https://studio.twilio.com/v2/Flows/FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Revisions?PageSize=50&Page=0",
    "page_size": 50,
    "key": "revisions"
  },
  "revisions": [
    {
      "sid": "FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
      "account_sid": "ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
      "author_sid": "USaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
      "friendly_name": "Test Flow",
      "status": "published",
      "revision": 1,
      "definition": null,
      "commit_message": null,
      "valid": null,
      "errors": null,
      "date_created": "2017-11-06T12:00:00Z",
      "date_updated": "2017-11-06T12:00:00Z",
      "url": "https://studio.twilio.com/v2/Flows/FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Revisions/1"
    }
  ]
}
```