Interceptor with Authorization header

authorization_interceptor.kt

import okhttp3.Interceptor
import okhttp3.Response

class AuthInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val accessToken = obtainAccessToken() // <-- how to get token? This might be a suspending call
        
        val request = chain.request()
        val newRequest = request.newBuilder()
            .addHeader("Authorization", accessToken)
            .build()
        return chain.proceed(newRequest)
    }
}