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App DevelopmentApp Development 

How to consume OAuth 1.0 REST webservice in salesforce

I have another application which I need to call and they are using OAuth 1.0. now I am calling their system endpoint, I have client id and client secret only.
Do I need to generate token also?
because when I tested on Postman its working fine with just giving endpoint url, client id and client secret.
Can anyone help me with samples?
I am getting bad request 400 as a response...