diff --git a/components/ChatWindow.tsx b/components/ChatWindow.tsx
index 8fc3210..6955087 100644
--- a/components/ChatWindow.tsx
+++ b/components/ChatWindow.tsx
@@ -12,8 +12,9 @@ import {
   shorten,
   shouldActivateGameMode,
   setupPostMessageHandlers,
+  debounce,
 } from '../helpers/utils';
-import {Message} from '../helpers/types';
+import {Config, Message} from '../helpers/types';
 import {isDev, getWebsocketUrl} from '../helpers/config';
 import Logger from '../helpers/logger';
 import {
@@ -47,12 +48,14 @@ type State = {
   customerId: string;
   conversationId: string | null;
   availableAgents: Array<any>;
+  isLoaded: boolean;
   isSending: boolean;
   isOpen: boolean;
   isTransitioning: boolean;
   isGameMode?: boolean;
   shouldDisplayNotifications: boolean;
   shouldDisplayBranding: boolean;
+  forceRequireEmailUpfront?: boolean;
 };
 
 class ChatWindow extends React.Component<Props, State> {
@@ -74,12 +77,14 @@ class ChatWindow extends React.Component<Props, State> {
       customerId: null,
       availableAgents: [],
       conversationId: null,
+      isLoaded: false,
       isSending: false,
       isOpen: false,
       isTransitioning: false,
       isGameMode: false,
       shouldDisplayNotifications: false,
       shouldDisplayBranding: false,
+      forceRequireEmailUpfront: false,
     };
   }
 
@@ -114,6 +119,7 @@ class ChatWindow extends React.Component<Props, State> {
     await this.fetchLatestConversation(customerId, metadata);
 
     this.emit('chat:loaded');
+    this.setState({isLoaded: true});
 
     if (this.isOnDeprecatedVersion()) {
       console.warn('You are currently on a deprecated version of Papercups.');
@@ -130,6 +136,31 @@ class ChatWindow extends React.Component<Props, State> {
     });
   }
 
+  async componentDidUpdate(prevProps: Props) {
+    if (!this.state.isLoaded) {
+      return;
+    }
+
+    const {greeting, shouldRequireEmail} = this.props;
+
+    if (greeting !== prevProps.greeting) {
+      this.debouncedHandleGreetingUpdated(greeting, prevProps.greeting);
+    }
+
+    // FIXME: how can we force email to show up correctly during the preview mode???
+    if (shouldRequireEmail !== prevProps.shouldRequireEmail) {
+      this.setState({forceRequireEmailUpfront: shouldRequireEmail});
+    }
+  }
+
+  debouncedHandleGreetingUpdated = debounce(async () => {
+    const {customerId: cachedCustomerId, customer: metadata} = this.props;
+    const isValidCustomer = await this.isValidCustomer(cachedCustomerId);
+    const customerId = isValidCustomer ? cachedCustomerId : null;
+
+    await this.fetchLatestConversation(customerId, metadata);
+  }, 800);
+
   emit = (event: string, payload?: any) => {
     this.logger.debug('Sending event from iframe:', {event, payload});
 
@@ -155,6 +186,8 @@ class ChatWindow extends React.Component<Props, State> {
         return this.handlePapercupsPlan(payload);
       case 'papercups:ping':
         return this.logger.debug('Pong!');
+      case 'config:update':
+        return this.logger.debug('Config updated dynamically:', payload);
       default:
         return null;
     }
@@ -692,6 +725,10 @@ class ChatWindow extends React.Component<Props, State> {
   // If this is true, we don't allow the customer to send any messages
   // until they enter an email address in the chat widget.
   askForEmailUpfront = () => {
+    if (this.state.forceRequireEmailUpfront) {
+      return true;
+    }
+
     const {customer, shouldRequireEmail} = this.props;
     const {customerId, messages = []} = this.state;
 
@@ -722,14 +759,7 @@ class ChatWindow extends React.Component<Props, State> {
   };
 
   isOnDeprecatedVersion = (): boolean => {
-    const {accountId, version = '1.0.0'} = this.props;
-
-    // TODO: remove after testing
-    if (accountId === '873f5102-d267-4b09-9de0-d6e741e0e076') {
-      return false;
-    }
-
-    return version < '1.1.2';
+    return this.props.version < '1.1.2';
   };
 
   renderEmbeddedGame() {
diff --git a/components/Widget.tsx b/components/Widget.tsx
index 3fca787..f644ead 100644
--- a/components/Widget.tsx
+++ b/components/Widget.tsx
@@ -6,29 +6,7 @@ import {isDev} from '../helpers/config';
 import {setupPostMessageHandlers} from '../helpers/utils';
 import getThemeConfig from '../helpers/theme';
 import Logger from '../helpers/logger';
-
-type Config = {
-  title?: string;
-  subtitle?: string;
-  primaryColor?: string;
-  accountId?: string;
-  baseUrl?: string;
-  greeting?: string;
-  customerId?: string;
-  newMessagePlaceholder?: string;
-  emailInputPlaceholder?: string;
-  newMessagesNotificationText?: string;
-  companyName?: string;
-  agentAvailableText?: string;
-  agentUnavailableText?: string;
-  showAgentAvailability?: boolean;
-  defaultIsOpen?: boolean;
-  requireEmailUpfront?: boolean;
-  closeable?: boolean;
-  mobile?: boolean;
-  metadata?: string; // stringified CustomerMetadata JSON
-  version?: string;
-};
+import {Config} from '../helpers/types';
 
 const parseCustomerMetadata = (str: string): CustomerMetadata => {
   try {
@@ -54,6 +32,7 @@ const sanitizeConfigPayload = (payload: any): Config => {
     newMessagePlaceholder,
     emailInputPlaceholder,
     newMessagesNotificationText,
+    requireEmailUpfront,
     agentAvailableText,
     agentUnavailableText,
     showAgentAvailability,
@@ -61,7 +40,7 @@ const sanitizeConfigPayload = (payload: any): Config => {
     version,
   } = payload;
 
-  return {
+  const updates = {
     accountId,
     title,
     subtitle,
@@ -72,12 +51,23 @@ const sanitizeConfigPayload = (payload: any): Config => {
     newMessagePlaceholder,
     emailInputPlaceholder,
     newMessagesNotificationText,
+    requireEmailUpfront,
     agentAvailableText,
     agentUnavailableText,
     showAgentAvailability,
     closeable,
     version,
   };
+
+  return Object.keys(updates).reduce((acc, key) => {
+    const value = updates[key];
+
+    if (typeof value === 'undefined') {
+      return acc;
+    }
+
+    return {...acc, [key]: value};
+  }, {});
 };
 
 type Props = {config: Config};
@@ -161,7 +151,7 @@ class Wrapper extends React.Component<Props, State> {
     const shouldRequireEmail = !!Number(requireEmailUpfront);
     const isMobile = !!Number(mobile);
     const isCloseable = !!Number(closeable);
-    const shouldHideAvailability = !!Number(showAgentAvailability);
+    const shouldShowAvailability = !!Number(showAgentAvailability);
     const theme = getThemeConfig({primary: primaryColor});
     const customer = parseCustomerMetadata(metadata);
 
@@ -179,7 +169,7 @@ class Wrapper extends React.Component<Props, State> {
           newMessagesNotificationText={newMessagesNotificationText}
           agentAvailableText={agentAvailableText}
           agentUnavailableText={agentUnavailableText}
-          showAgentAvailability={shouldHideAvailability}
+          showAgentAvailability={shouldShowAvailability}
           shouldRequireEmail={shouldRequireEmail}
           isMobile={isMobile}
           isCloseable={isCloseable}
diff --git a/helpers/types.ts b/helpers/types.ts
index b22edd7..73e735c 100644
--- a/helpers/types.ts
+++ b/helpers/types.ts
@@ -27,3 +27,26 @@ export type Attachment = {
   file_url: string;
   content_type: string;
 };
+
+export type Config = {
+  title?: string;
+  subtitle?: string;
+  primaryColor?: string;
+  accountId?: string;
+  baseUrl?: string;
+  greeting?: string;
+  customerId?: string;
+  newMessagePlaceholder?: string;
+  emailInputPlaceholder?: string;
+  newMessagesNotificationText?: string;
+  companyName?: string;
+  agentAvailableText?: string;
+  agentUnavailableText?: string;
+  showAgentAvailability?: boolean;
+  defaultIsOpen?: boolean;
+  requireEmailUpfront?: boolean;
+  closeable?: boolean;
+  mobile?: boolean;
+  metadata?: string; // stringified CustomerMetadata JSON
+  version?: string;
+};
diff --git a/helpers/utils.ts b/helpers/utils.ts
index 84dc2d2..1659311 100644
--- a/helpers/utils.ts
+++ b/helpers/utils.ts
@@ -60,3 +60,13 @@ export function setupPostMessageHandlers(w: any, handler: (msg: any) => void) {
     return () => w.detachEvent('message', cb);
   }
 }
+
+export function debounce(fn: any, wait: number) {
+  let timeout: any;
+
+  return function (...args: any) {
+    clearTimeout(timeout);
+
+    timeout = setTimeout(() => fn.call(this, ...args), wait);
+  };
+}