How use call API with new library version 7.0.0

[developerGM]

I am using this library version 7.0.0 and I am developing in java,

Cannot use this code because not exists this enqueue:

client.mutateGraph(mutationQuery).enqueue(new GraphCall.Callback<Storefront.Mutation>() {

  @Override public void onResponse(@NonNull final GraphResponse<Storefront.Mutation> response) {
    if (response.data().getCustomerReset().getUserErrors().isEmpty()) {
      String firstName = response.data().getCustomerReset().getCustomer().getFirstName();
      String lastName = response.data().getCustomerReset().getCustomer().getLastName();
    } else {
      Log.e(TAG, "Failed to reset customer");
    }
  }

  @Override public void onFailure(@NonNull final GraphError error) {
    Log.e(TAG, "Failed to execute query", error);
  }
});

I need to change to

client.mutateGraph(mutationQuery).enqueue(new Function1<GraphCallResult<? extends Storefront.Mutation>, Unit>() {
                @Override
                public Unit invoke(GraphCallResult<? extends Storefront.Mutation> graphCallResult) {

                    // here I need GraphResponse

                    return null;
                }
            });

how can I read results??

[developerGM]

Can be a solution in Java?

            client.mutateGraph(mutationQuery).enqueue(graphCallResult -> {
                if (graphCallResult instanceof GraphCallResult.Success) {
                    GraphResponse<Storefront.Mutation> res = ((GraphCallResult.Success<Storefront.Mutation>) graphCallResult).getResponse();
                    String token = res.getData().getCustomerAccessTokenCreate().getCustomerAccessToken().getAccessToken();
                } else {
                    String error = "";
                }
                return Unit.INSTANCE;
            });