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PKCE Authorization code grant without using browser agent?

#1

Hi Auth0 Community
First of all thanks for the support you guys have been providing to make our job easy.
Now coming to my question, Actually I was trying to build authentication in secure way for native iOS/Android sdks using Auth0, PKCE looks me prominent one as it does not use client secret that is my exact requirement. Basically I want to have Auth0 Client and without having secret I want to get access token internally within my native sdk to do further apis calls in secure way, As these SDKs will integrate with mobile applications so I don’t want my sdk to open browser to do hip-hop when app initializes my sdk,The way iOS/Android Auth0 sdks those does not ask client secret but just client-id and domain name is enough same way we are also looking for, what internally it is using no idea if any one knows that ?
OR Is there is any way to implement exactly PKCE but without use of browser or any similar alternate protocol ?