Android retrofit admin api authorization error

Hello. I want to get count of resources from android phone. I want to use admin api, as i understant admin api is not supported from android cloudinary library. I'm using retrofit for http request.

private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

private static Retrofit mRetrofit = new Retrofit.Builder()
        .addConverterFactory(GsonConverterFactory.create())
        .baseUrl(StaticKeys.API_AUTH_BASE_URL)
        .build();

public static Call<List<ImageResourcesResponse>> getCloudinaryResources(StaticKeys.IMAGE tag) {
    CloudinaryResources cloudinaryResources = mRetrofit.create(CloudinaryResources.class);
    final String auth = "Basic " +
            Base64.encodeToString(
                    (StaticKeys.API_KEY + ":" + StaticKeys.API_SECRET).getBytes(), Base64.NO_WRAP);
    return cloudinaryResources.getInfoResources(auth);
}

public interface CloudinaryResources {
    @GET("resources/image")
    Call<List<ImageResourcesResponse>> getInfoResources(@Header("Authorization") String authorization);
}

And it always said, that i/m not authorized. What problem?

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