Below is the approach :

1. Got the Base64 code from a third party provider via REST service .

2. Passed that Base64 code in an activity to generate a PDF in a new window using the below code successfully .

String s = tools.getParamValue("Data").toString();  //Data is the base64 encoded string (Parameter) byte[] byteArray = new com.pega.pegarules.pub.util.Base64Util().decodeToByteArray(s); tools.putParamValue("Data",byteArray); tools.sendFile(byteArray,"PDFName.pdf",false, null, true);

3. Need a good approach to pass this Base64code to a fixed mail format and have the whole thing(mail+Attachment) stored in some property (the same will be passed to repository) .