EposSDK-Payment.java

import com.jakewharton.rxrelay2.BehaviorRelay;
import com.jakewharton.rxrelay2.Relay;

import de.wirecard.epos.util.events.Event;
import de.wirecard.epos.util.events.TerminalEvent;
import de.wirecard.epos.util.events.acceptance.AppSignatureConfirmationEvent;
import io.reactivex.android.schedulers.AndroidSchedulers;

Relay<Event> eventRelay = BehaviorRelay.create();
eventRelay
        .observeOn(AndroidSchedulers.mainThread())
        // Updates during the payment flow
        .subscribe(event -> {
            if (event instanceof TerminalEvent.SignatureRequest) {
                // In the case when the Cardholder Signature is required by the Payment flow
                // Your task is to respond to it by collecting the signature image from the customer and
                // posting it back in the signatureEntered method
                String img = "signature image in Base64 format";
                ((TerminalEvent.SignatureRequest) event).signatureEntered(img.getBytes());      // image in base 64
                ((TerminalEvent.SignatureRequest) event).signatureCanceled();                   // sale canceled, because signature was not collected
            }
            else if (event instanceof TerminalEvent.SignatureConfirmation) {
                // In the case when the Cardholder Signature was collected then the merchant is required to confirm its validity
                // A. If the terminal has buttons that are used for Approving/Rejecting then this is either never called from Payment flow
                // or its AppSignatureConfirmationEvent comes null
                // B. If the terminal does not have buttons then the Application must present a user interface to Approve/Reject the Cardholder Signature
                ((TerminalEvent.SignatureConfirmation) event).getEnteredSignature();            // signature confirmation can be performed in terminal or in app
                if (event instanceof AppSignatureConfirmationEvent) {                           // this event indicates it has to be confirmed in app side
                    ((AppSignatureConfirmationEvent) event).signatureConfirmed();               // signature confirmed in app
                    ((AppSignatureConfirmationEvent) event).signatureCanceled();                // signature confirmation canceled in app
                }
            }
            else if (event instanceof TerminalEvent.PaymentInfo) {
                // provided some information during payment which can be shown to user
                ((TerminalEvent.PaymentInfo) event).getAppLabel();
                ((TerminalEvent.PaymentInfo) event).getApplicationId();
                ((TerminalEvent.PaymentInfo) event).getCardholderName();
                ((TerminalEvent.PaymentInfo) event).getPanTag();
            }
            else if (event instanceof Event.Update) {
                // update events indicates change of progress
                ((Event.Update) event).getMessage(context);
            }
            else if (event instanceof Event.PasswordConfirmation) {
                //wechat payment method can ask for confirmation, that customer entered pin
                onPasswordConfirmation((Event.PasswordConfirmation) event);
            }
        });