Chinese text cannot be displayed properly on Paypal IPN Login to Paypal -> Profile -> Language Encoding -> More Options -> UTF-8
Find Latest Paypal API Version https://developer.paypal.com/webapps/developer/docs/classic/release-notes/
Require Phone Number in Paypal Express Checkout http://www.redbridgenet.com/development/require-phone-number-in-paypal-express-checkout/