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Cloud EliteCloud Elite 

How can I update the registration handler class to call out to external service to verify if the user exists in that data base or not before self register on community ?

Need to understand the architecture of the solution. the use case is as follow: 
1. allow self register on community 
2. before user self register in community, run verification against external service that return exist or not exist. if exist then create user if not through an error 
3. user will be presented with a message that they can't be created and need to reach out to account executive for solution 
Please share any error handling in case the call out fail. also what other setup needed to do so. 
thank you 
VinayVinay (Salesforce Developers) 
Hi Cloud,

You can reach out to Accelerators if you have premier support level for inputs on your implementation.