GitHub Source Code: https://github.com/magulan/Salesforce-Message-Channel SampleChannel.messageChannel-meta.xml: <?xml version=”1.0″ encoding=”UTF-8″?><LightningMessageChannel xmlns=”http://soap.sforce.com/2006/04/metadata”>    <masterLabel>SampleChannel</masterLabel>    <isExposed>true</isExposed>    <description>This is a sample Lightning Message Channel.</description>    <lightningMessageFields>        <fieldName>variable1</fieldName>        <description>Variable 1</description>    </lightningMessageFields>    <lightningMessageFields>        <fieldName>variable2</fieldName>        <description>Variable 2</description>    </lightningMessageFields></LightningMessageChannel> Aura: Component: <aura:component implements=”flexipage:availableForAllPageTypes” access=”global”>        <aura:attribute type=”String” name=”ReceivedMessage”/>        <lightning:messageChannel onMessage=”{!c.onMessageReceive}”                               scope=”APPLICATION”                               type=”SampleChannel__c”                              aura:id=”sampleMessageChannel”/>        <div class=”slds-box slds-theme–default”>                <lightning:button label=”Publish” onclick=”{! c.publish }”/><br/><br/>            … Continue reading Subscribe, Unsubscribe MessageChannel in LWC, Aura and Visualforce Page in Salesforce