Extract secure credential store

Hi all,

We are storing credentials of external system(Web Service) in third party credentials store and we are successfully able to get service response using httppostwithresponsewithscs() custom plugin function. but now we wanted to use integration object and there we need to provide basic authentication so instead of that we wanted to use external system key which will access credentials stored at secure credential store. So we tried multiple ways by using httpAuthenticationBasic() function but no luck .
How can I achieve it?

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