how to deploy restful client in concrete5.7 for authentication

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Hi,

I'm quiet new to concrete5 and just trying to figure out a solution for my project, issue is i need to deploy a restful client in my concrete5.7 portal for users authentication, So here the users data is maintained somewhere else and I need make a restful call to authenticate the user while disabling the concrete core authentication. Please advice me on this.

Thanks,
Venu