public class NormalSheetFragment extends Fragment implements View.OnClickListener {

// ......
    private ImageView samsungPayButton;
// ......
    private void initView() {
// ......
    samsungPayButton = (ImageView) fragmentView.findViewById(R.id.samsungpaybutton);

    // SDK Method Test Buttons Listeners
    // ......
    samsungPayButton.setOnClickListener(this);

    // SDK Method Test Buttons
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //......
            case R.id.samsungpaybutton:
                samsungPayButton.setVisibility(View.GONE);
                startInAppPay();
                  break;
            //......
        }
    }

    private void checkSamsungPayStatus() {
        Bundle bundle = new Bundle();
        bundle.putString(SamsungPay.PARTNER_SERVICE_TYPE,
SamsungPay.ServiceType.INAPP_PAYMENT.toString());
        PartnerInfo partnerInfo = new PartnerInfo(serviceId, bundle);
        SamsungPay samsungPay = new SamsungPay(context, partnerInfo);
        try { 
            samsungPay.getSamsungPayStatus(new StatusListener() {
                @Override
                public void onSuccess(int status, Bundle bundle) {
                    switch (status) {
                        case SamsungPay.SPAY_NOT_SUPPORTED:
                            // Samsung Pay is not supported
                            samsungPayButton.setVisibility(View.INVISIBLE);
                            break;
                        case SamsungPay.SPAY_NOT_READY:
                            // Activate Samsung Pay or update Samsung Pay, if needed
                            samsungPayButton.setVisibility(View.INVISIBLE);
                            break;
                        case SamsungPay.SPAY_READY:
                            // Samsung Pay is ready
                            samsungPayButton.setVisibility(View.VISIBLE);
                            break;
                        default:
                            // Not expected result
                            samsungPayButton.setVisibility(View.INVISIBLE);
                            break;
                    }
                }

                @Override
                public void onFail(int errorCode, Bundle bundle) {
                    samsungPayButton.setVisibility(View.INVISIBLE);
                    Log.d(TAG, "checkSamsungPayStatus onFail() : " + errorCode);
                }
            });

            /*
             * Thrown if the callback passed is null.
             */
        } catch (NullPointerException e) {
            e.printStackTrace();
        }
    }

//......

ArrayList<PaymentManager.Brand> brandList = new ArrayList<>();
// If the supported brand is not specified, all card brands in Samsung Pay are
// listed in the Payment Sheet.
brandList.add(PaymentManager.Brand.MASTERCARD);
brandList.add(PaymentManager.Brand.VISA);
brandList.add(PaymentManager.Brand.AMERICANEXPRESS);

PaymentInfo paymentInfo = new PaymentInfo.Builder()
	// ......
	// Merchant requires billing address from Samsung Pay and sends the shipping address to 
	//Samsung Pay.
	// Show both billing and shipping address on the payment sheet.
	.setAddressInPaymentSheet(PaymentInfo.AddressInPaymentSheet.NEED_BILLING_SEND_SHIPPING)
	// Option is either SEND_SHIPPING or NEED_BILLING_SEND_SHIPPING, shipping address should be set
	// from merchant app
	.setShippingAddress(shippingAddress)
	// ......
	.build();