XML file in Apex Class 

public with sharing class domXmlParsing {
    
    //method to parse xml file 
    public static string walkThrough(){
        
        //XML string to parse
        String response = '<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">'
            + '<S:Body>'
            + '<wss:createPendingTicketResponse xmlns:wss="http://www.boomi.com/connector/wss">'
            + '<wss:createPaymentTransctionLogResponse/>'
            + '<PendingTicket xmlns:pay="http://www.boomi.com/v1b/Payment">'
            + '<pay:Response>'
            + '<pay:R10TillID>test001</pay:R10TillID>'
            + '<pay:R10SequenceNumber>test002</pay:R10SequenceNumber>'
            + '<pay:SFTnxId>test003</pay:SFTnxId>'
            + '<pay:R10TnxID>'+ 'TESTME' +'</pay:R10TnxID>'
            + '<pay:Org>test004</pay:Org>'
            + '</pay:Response>'
            + '</PendingTicket>'
            + '</wss:createPendingTicketResponse>'
            + '</S:Body>'
            + '</S:Envelope>';
        
        //dom
        Dom.Document doc = new Dom.Document();
        
        //string
        string result;
        
        //load document
        doc.load(response);
        
        Dom.XMLNode envelope = doc.getRootElement();
        system.debug('!!!!!!!!! value of envelope' + envelope);
        
        //body
        Dom.XMLNode body = envelope.getChildElement('Body', 'http://schemas.xmlsoap.org/soap/envelope/'); 
        system.debug('@@@@@ value of body' + body);
        
        //child element of createPendingTicketResponse
        Dom.XMLNode createPendingTicketResponse = body.getChildElement('createPendingTicketResponse', 'http://www.boomi.com/connector/wss'); 
        system.debug('@@@@@ value of createPendingTicketResponse' + createPendingTicketResponse);
        
        //child element of createPaymentTransctionLogResponse
        Dom.XMLNode createPaymentTransctionLogResponse = createPendingTicketResponse.getChildElement('createPaymentTransctionLogResponse', 'http://www.boomi.com/connector/wss'); 
        system.debug('@@@####@@ value of createPaymentTransctionLogResponse' + createPaymentTransctionLogResponse);
        
        //child element of pending Ticket
        Dom.XMLNode PendingTicket = createPendingTicketResponse.getChildElement('PendingTicket', null); 
        system.debug('@@@####@@ value of PendingTicket' + PendingTicket);
        
        //child element of Response 
        Dom.XMLNode Respon = PendingTicket.getChildElement('Response', 'http://www.boomi.com/v1b/Payment'); 
        system.debug('@@@####@@ value of Response' + Respon); 
        
        //child element of R10TnxID
        Dom.XMLNode R10TnxID = Respon.getChildElement('R10TnxID', 'http://www.boomi.com/v1b/Payment'); 
        system.debug('@@@####@@ value of R10TnxID' + R10TnxID); 
        
        //here is the value in R10TnxID
        result = R10TnxID.getText();
        system.debug('@@@####@@ value of result' + result); 
        
        return result;
    }
}

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