(sorry for my english). I have implemented Paypal sdk for android, it works fine! But maybe for my english I don´t understand what i have to do here:

@Override
protected void onActivityResult (int requestCode, int resultCode, Intent data) {
    if (resultCode == Activity.RESULT_OK) {
        PaymentConfirmation confirm = data.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
        if (confirm != null) {
            try {
                Log.i("paymentExample", confirm.toJSONObject().toString(4));

               // TODO: send 'confirm' to your server for verification.
                // see https://developer.paypal.com/webapps/developer/docs/integration/mobile/verify-mobile-payment/
                // for more details.

            } catch (JSONException e) {
                Toast.makeText(this, "Ha ocurrido un error, inténtelo de nuevo en unos instantes", Toast.LENGTH_LONG).show();
                IrActivityAnterior();
            }
        }
    }

I have read about it but I don´t know if I need to send a proof of payment to the person who has bought my app or if I only need to get this proof and save it. And the other question is how can I verify it? What steps I need to follow??

Thank you!!