Hello

I have added apex class and VF Page to override standard convert button to Accept Button. The mentioned below code is working fine. But it is getting converted in Classic Version. But need the lead Conversion Page in Lightning Version. Anyone Please suggest.

public class AutoConvertLeads {
    
    private final Lead lead; //variable for the standard Lead object
    
    public AutoConvertLeads(ApexPages.StandardController standardPageController) {
        this.lead = (Lead)standardPageController.getRecord(); //initialize the standard controller
    }
    
    public PageReference redirectToConvertionPage() {
        PageReference nextPage = new PageReference('/lead/leadconvert.jsp'); //set the starting point for the page reference to which the User will be sent
        nextPage = encodeAndSetParam(nextPage, 'retURL', lead.Id); //set the retURL parameter in order to allow for returning to Lead if User cancels from page
        nextPage = encodeAndSetParam(nextPage, 'id', lead.Id); //set the id parameter so that the conversion page knows the proper record
        nextPage = encodeAndSetParam(nextPage, 'nooppti', '1'); //set the nooppti parameter to pre-populate the "Do not create a new opportunity upon conversion." checkbox
        nextPage = encodeAndSetParam(nextPage, 'nooverride', '1'); //set the nooverride parameter in order to prevent looping in the user interface
        nextPage.setRedirect(true); //indicate that the redirect should be performed on the client side
        return nextPage; //send the User to the Lead conversion page
    }
    
    public PageReference encodeAndSetParam(PageReference passedPageReference, String passedParameterId, String passedParameterValue){
        if (passedParameterValue != null) { //if the passedParameterValue is not null
            String encodedParameterValue = EncodingUtil.urlEncode(passedParameterValue, 'UTF-8'); //encode the value that was passed to eliminate conflicts with unsafe characters
            passedPageReference.getParameters().put(passedParameterId, EncodingUtil.urlDecode(encodedParameterValue, 'UTF-8')); //add the parameter to the page reference
        }
        return passedPageReference;
    }

}

Visual Force Page:

<apex:page action="{!redirectToConvertionPage}" extensions="AutoConvertLeads" standardController="Lead">
    <apex:sectionHeader title="Accept" subtitle="{!Lead.Name}" help="/htviewhelpdoc?id=leads_convert.htm&siteLang=en_US"></apex:sectionHeader>
    <apex:pageMessages ></apex:pageMessages>
</apex:page>


Thanks
TS