Paypal Integration Interview Questions and Answers

PayPal is an Online Payments System. 
Online money transfers serve as electronic alternatives to traditional paper methods like checks and money orders. 
PayPal is one of the world's largest internet payment companies.
From: Wikipedia 



Question: When Paypal was founded?
June 1998


Question: Who is CEO of Paypal?
Dan Schulman


Question: What is offical website of Paypal?
www.paypal.com


Question: In which language paypal is written?
C++, JavaScript


Question: What is PayPal Sandbox?
PayPal sandbox is a testing environment of paypal.com. Developer first create account in Sandbox(https://developer.paypal.com/) and integrate the payment with sandbox. After completing all (including testing), then update the API keys.


Question: What is recurring payment?
When Customer pay fixed amount on a regular basis to the merchant is know as recurring payment. For Example: You buy a home and pay some amount on regular basis to bank for x months.


Question: What is Website Payments Standard?
Accept online payments from customers with with OR without PayPal accounts.
In this website, accept credit/debit cards (Visa, MasterCard, American Express and Discover), eChecks, bank transfers, and PayPal accounts.


Question: Is it compulsary to create paypal account for customer, when doing payment with paypal.com?
No, Customer can pay with credit/debit card on paypal.com. He have option to paypal account.


Question: Does paypal support mulitple language?
Yes.


Question: Can we customize the checkout page on paypal.com as per requirement?
Yes, You can customize the logo, item detail and description etc by passing some optional parameter.


Question: What is Paypal Pro Account?
When you want customer must do payment on your website (customer never leave website OR Never redirect to paypal.com) with credit card/debit card.



Question: Can I create payment buttons using an paypal API?
Yes


Question: Does paypal support payment by Mobile?
Yes, https://developer.paypal.com/webapps/developer/docs/classic/products/#mobile


Question: What is PayPal Express Checkout?
PayPal Express Checkout is a powerful API-based solution that can be integrated into any merchant website. With PayPal Express Checkout API, customer leave the merchant website and complete the transaction in paypal.com, where customer can pay with paypal.com OR with credit card / Debit card. When start processing, Paypal gives a TOKEN key which is used to charge money from customer OR get the Payment Details OR Customer Shipping/Billing details. Developer should save this token key for future use. Read More


Question: What is Paypal Adaptive Payment?
Paypal Adaptive Payments is feature of Paypal Pro means you must have Paypal pro account for use this payment method. In this customer can pay with Credit Card/Debit Card/Paypal.com account. While paying with Credit card/Debit card he can also create a account in paypal.com. Adaptive payments handles payments between a sender and one or more receivers. Read more


Question: What are two different types of Adaptive Payment?

• Adaptive Parallel Payment
• Adaptive Chain Payment

Question: What is Do-Direct Payment?
Direct Payment lets buyers pay using their credit cards and amount is directly transferred to merchant account.


Question: What is MayPay Payment?
Merchant can send the money to two or more personal in single transaction.


Question: How to create paypal buy now button on paypa.com?
http://www.web-technology-experts-notes.in/2013/02/paypal-buy-now-button.html


Question: What is notify URL in PayPal?
When we send our customer to paypal.com for payment. We send notify_url=http://www.mysite.com/notify_url.php along with price and item detail.
After completing the process PayPal returns data back to our site via what they call IPN (Data is send to the notify_url with post method). Now we save this all data in our database for further inquiry.


Question: What is paypal cancel url?
An mywebsite URL where the user will be returned if payment is cancelled by customer on paypal.com.
Cancel URL send as below:
CANCELURL=http://www.mysite.com/cancel_url.php


Question: Do website need SSL for accepting payments?
Yes, you must have SSL Integration in website.


Question: What are basic information which you must pass to the paypal for every transaction.
Following are different parameter which we must pass.

• USER
• PWD
• SIGNATURE
• VERSION
• METHOD
• PAYMENTACTION

Question: How to add button to get payments?
https://www.paypal.com/cgi-bin/webscr?cmd=_wp-standard-integration-outside#sectiona


Question: From where I can create Sandbox Account?
https://developer.paypal.com/

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Android Interview Questions and Answers for Freshers

Question: What is Android?
Open source operating system used for smartphones and tablet computers.


Question: In which languages Android is written?
C, C++, Java


Question: What is Initial release date?
September 23, 2008


Question: What is Latest release of Android?
Version: 6.0.1 "Marshmallow"
Date: December 09, 2015


Question: What is offical website of Android?
http://www.android.com


Question: Who are Inventors of android?
Andy Rubin, Rich Miner, Nick Sears


Question: What are Features of Android OS?

• Live wallpaper
• Camera
• Messaging
• Music
• Alarm
• Bluetooth
• WIFI
• Web Browsing

Question: What are Advance Features of Android OS?

• Google now
• NFC (Near Field Communication)
• Use phone by joystick
• Connect your phone with LED TV via MHL or micro HDMI cable
• Screen Capture
• Unlock your phone by your face
• Multitasking
• Data Usages

Question: Tools Required for Developing Android Apps?
Java Development Kit (JDK)
Android Development Tools (ADT)
Software Development Kit (SDK)


Question: What is Full form of JDK?
Java Development Kit


Question: What is Full form of ADT?
Android Development Tools


Question: What is Full form of SDK?
Software Development Kit


Question: What is full form of AIDL?
Android Interface Definition Language


Question: What is full form of ANR?
Application Not Responding


Question: What are Advantages of android?
Open-source
Platform-independent


Question: What language you should know to develop android application?
Java
XML


Question: What is Activities?
Activity is a single, focused thing that the user can do.
When ever user click on GUI the next Activity will be start and new GUI set base on coding.


Question: What is AVD?
Full form of AVD is Android Virtual Device (emulator).
Android SDK includes a mobile device that is know as virtual device.


Question: Can you deploy executable JARs on Android? Which packaging is supported by Android?
No


Question: Where can you define the icon for your Activity?
In manifest file.


Question: Where will you declare your activity so the system can access it?
In manifest file.


Question: How will you pass data to sub-activities?
Use Bundles to pass data to sub-activities.


Question: What is an Action?
Action in Android is something that an Intent sender wants to complete.


Question: Can we change the name of an application after its deployment?
Not recommended.


Question: How can two Android applications share same Linux user ID and share same VM?
To do this must sign with the same certificate.


Question: Explain about folder structure in Android development.
Following are different folder in Android
src: Contains the .java source files for your project.
gen: This folder contains the R.java file. It is compiler-generated file that references all the resources found in your project.
Android 4.0 library: This folder contains android.jar file, which contains all the class libraries for an Android application.
assets: This folder contains all the information about HTML file, text files and databases etc.
bin: It contains the .apk file (Android Package).
res: This folder contains all the resource file that is used by android application.


Question: What is Intents in android?
An Android application can contain zero or more activities. If you want to navigate from one activity to another then android provides you Intent class and these class are available inandroid.content.Intent package.


Question: What are the key components of Android Architecture?

• Linux Kernel
• Libraries
• Android Framework
• Android Applications

Question: What is an Explicit Intent?
Explicit intent specifies the particular activity that should respond to the intent.


Question: When does onResume() method called?
onResume is called when activity come to foreground.


Question: What are the different storage methods in android?

• Internal Storage
• External Storage
• Shared Preferences
• SQLite Databases

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