1. Login to POS Back Office > Select “ Settings ” from main menu > Go to the “ Payment Types”
 ,
Click on &ldquo,Add Payment Type&rdquo, and create a new payment type
Tick On &ldquo,Payment gateway enable&rdquo,
Select PAX or Wallee Gateway from dropdown
Click the &ldquo,Update&rdquo, button
( PAX or Wallee devices should connected to the same Wi-Fi network which connected the POS Device)
2.1 Open the Sierra app on your A920, look for the Function tab and tap it. It will prompt for a password, go into System settings and scroll near the bottom, locate ECR-Terminal Integration Mode and change it from Internal POS/Standalone to External POS.
 ,
Then navigate to Wi-Fi settings for the terminal and enter the password pax9876@@ to get into settings. Go into Wi-Fi, click the Wi-Fi setting, click Wi-Fi network, and locate the IP address of the terminal. ,
Navigation flow ,
(Setting app ->, add password - >, select wifi connection ->, add IP address in POS side) ,
Once setup is complete go to TYTS application for payment process otherwise operation will not work. ,
2. 2 Link POS App and PAX / Wallee Device
 ,
POS App main menu
Select &ldquo, Settings &rdquo,
Select &ldquo,Payment Gateway&rdquo,
Enter Payment Device&rsquo,s IP Address and Port
Keep ON the status
Click &lsquo,Save&rdquo, button
3. How to Do a Transaction
 ,
POS App Side
POS App main menu
Select &ldquo, New Sale &rdquo,
Select item and click &ldquo,Charge&rdquo, button
Once you click &ldquo, Charge&rdquo, button in Payment Interface, you will see payment types
Click on the correct Payment type from dropdown menu
Click &ldquo,Charge&rdquo, button
Tick the correct gateway and click OK
(At this moment customer card should be Tap / Swipe or Enter through the Card Machine)