Hi harsha, Thanks for your prompt reply. I'm not pretty sure about my understanding of patches. Ok here is what I have done. I had a requirement of sending an email whenever a user signs up in the API Store, So what I did was extend the *UserSignUpWorkflowExecutor* class and also wrote the logic for sending email to the user in my complete method then depending on whether the status is approved or not I send an email. So Initially I made a jar file and followed the procedure mentioned in : https://docs.wso2.com/display/AM190/Customizing+a+Workflow+Extension But when I ran API manager, there was an exeption that the DTO class was not found, which made me realize that in the sample code there was an SubscriptionWorkflowDTO class that contained details about subscriptions being created but there was no UserSignUpDTO class available. So Now I have a sample class that extends the *UserSignUpWorkflowExecutor* class and i have implemented the same kind of logic implented in *UserSignUpWSWorkflowExecutor* class with an additional capability of sending an email. So in this scenario, will applying a patch do? If so will save me a lot of time and effort. Can you suggest what should be the best approach
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