Here's what I found from FAQs
STEP 6: Send an email to [email protected] with the following format:
Subject: "GCash AMEX – Paypal"
Message: 4-digit PayPal verification code request: (Your registered Globe/TM mobile phone number),
(Your GCash American Virtual Pay card number)
STEP 7: After receiving your 4-digit PayPal verification code, log in again to your PayPal account and click "Get Verified".
please call 2882 using your Globe mobile phone or (02)739-2882 to be assisted better
I have already verify Paypal through GCash Amex and for that procedure of sending an email request to globe cs.And they will email your four digit Paypal code which you can verify to the Paypal account to link the Gcash Amex.
This is what i recieve from my email
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