Flutter Chatbot SDK

Migration Guide for Android#

Version 1.x had an issue where a corrupted ymAuthentication token was passed in some cases from SDK to the server. The conversation history was thus mapped to the corrupted ymAuthenticationToken

Version 2.x has fix for this issue and thus a correct ymAuthenticationToken is always passed. However, as the correct ymAuthentication is different from the corrupted token, our server treats this user as a new user which leads to a complete loss of history of user conversations. The user will have a fresh start after updating the app.


  1. ymAuthentication was corrupted only when it contained = character in 1.x versions
  2. This issue was happening only on Android platform.

For more info feel free to email us at [email protected]



$ flutter pub add ymchat_flutter

or manually add dependency to the pubspec.yaml

ymchat_flutter: <version>


File provider#

Add following key in your strings.xml file found at yourproject/platforms/android/app/src/main/res/values/strings.xml, this will override default file provider used by SDK.

Overriding the file provider path will avoid conflict with other app using YM CHATBOT SDK. You can use your application id and suffix it with ".fileprovider" Example - applicationId : "com.abc.xyz" then application_id_for_provider = com.abc.xyz.fileprovider

<string name="application_id_for_provider">your.application.id.fileprovider</string>


Import the YMChat library in your dart file.

import 'package:ymchat_flutter/ymchat_flutter.dart';

Set botId#

This is the first and compulsary step.


YM AuthenticationToken#

ymAuthenticationToken is used to associate an identity of the user with the chat bot.

Whenever chatbot is launched with ymAuthenticationToken it will load the previous chats associated with this user since inception.


Note: History will load only when Show history flag is enabled in the channel settings

Push Notifications#

ymchat_flutter supports firebase notifications. Pass your FCM token in setDeviceToken method.


Note: Firebase service account key is required to send notifications. You can share the service account key with us. More info here


A specific journey can be triggered on launch, by passing the slug in the payload.

YmChat.setPayload({ "name": "Integration", "type": "Flutter" });

Payload can be used to pass information from host app to bot. The payload dictionary should be JSON compatible else an error will be thrown

For passing data from bot to app refer bot Bot Events

payload security

Payload is securely passed in HTTPS post request to protect the information passed in it

Trigger journey#

A specific journey can be triggered on launch, by passing the slug in the payload.

YmChat.setPayload({ "JourneySlug" : "checkout-cart" });

On-Premise / Region Specific deployments#

ymchat_flutter supports bots with on-prem deployments. For the bot to work, pass the on-prem URL to setCustomURL() method.


If the bot is deployed in a specific region(e.g. r1,r2,r3..rn)) on yellow.ai cloud, set the customBaseUrl as follows


Here rx = r1,r2,r3,r4,r5 etc

Custom loader#

You can customize the loading image while bot loads. Just pass the URL in the following way. It is recommended to use jpg, png, svg or gif


V2 bot#

You can enable V2 bot by calling setVersion() method. Default value is 1


Speech to Text#

Speech to text can be enabled and disabled by calling setEnableSpeech(). Default value is false


Hide Input Bar#

You can hide the input bar while bot is loading by calling the setDisableActionsOnLoad API . Default value is false



Status bar#

Status bar color can be set by calling setStatusBarColor method


Close button#

Close button color can be set by calling setCloseButtonColor method



If you are supporting Speech recognition, add following snippet to Info.plist of the host app

<string>Your microphone will be used to record your speech when you use the Voice feature.</string>
<string>Speech recognition will be used to determine which words you speak into this device&apos;s microphone.</string>

Info.plist is found at path


Present chatbot#

Chat bot can be presented by calling startChatbot(). This method will display full screen chat view


Bot Events#

Bot events are used to pass information from bot to app. For passing events from app to bot refer Payload

EventChannel _ymEventChannel = const EventChannel("YMChatEvent");
_ymEventChannel.receiveBroadcastStream().listen((event) {
Map ymEvent = event;
log("${ymEvent['code']} : ${ymEvent['data']}");

Bot close event#

Bot close event is separetly sent and it can be handled in following way.

EventChannel _ymCloseEventChannel = const EventChannel("YMBotCloseEvent");
_ymCloseEventChannel.receiveBroadcastStream().listen((event) {
bool ymCloseEvent = event;

Close bot#

Bot can be programmatically closed using closeBot() function


Unlink Device Token#

If you want to stop receiving push notifications you can unlink the device token. Device token typically is unlinked when the user logs out of the app.

() {
log("Device token unlinked");
(failureMessage) {

API key can be generated/found by visiting https://cloud.yellow.ai -> Overview -> Configure -> API Key section

Existing client can upgrade their dependency to v2.1.+ and replace exisitng key with new API Key. Client using SDK version below v2.1.0 will have no impact.

Demo App#

A demo app can be used as a reference to better understand how this SDK can be integrated in the app https://github.com/yellowmessenger/ymchat-flutter-demo