force poeple to enter phone numbers in paypal

is there a way to force customers to enter their phone numbers in paypal.
I am doing paypal express checkout using php
Desire2changeAsked:
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David H.H.LeeCommented:
Hi Desire2change,
>>there a way to force customers to enter their phone numbers in paypal.
You should able to stop the user to proceed to checkout page if the customer not yet fill in their phone number. This can be done in client script code for validation section.
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