There is no physical store of GCash in China, only in the Philippines, which is generally called GlobeStore. To register for GCash, you must first have a Philippine number. It is recommended to choose Globe. The signal is good and the cost is low. You can roam within the country and receive text messages for free. After you have a Philippine number, go to the Appstore or google play to download the GCash APP, and then follow the prompts to register.
Unverified GCash accounts can only be recharged offline, which means that if you are going to the Philippines, you can recharge at any Philippine 711 store. This store is everywhere, and recharging is quite convenient. GCash that has passed the verification can be remitted through Hong Kong Alipay or Western Union.
Only verified GCash accounts can transfer funds to friends. There are two situations for verification, online and offline. So far, there have been no cases of successful online verification. Offline is to go to GlobeStore, just have your passport.
My GCash account has been verified and I can transfer funds to other GCash accounts. I also applied for a GCash physical credit card, which is a MasterCard card. American Express card by GCash.