PayPal allows a telephone number to be included in the Store order checkout process, but this is not automatically enabled in PayPal.
PayPal Business Account Settings
In your PayPal Business Account, click your name in the top-right corner to access the dropdown options
Click 'Account Settings'
From the left sidebar under PRODUCTS & SERVICES, click 'Website payments'
To the right of 'Website preferences', click the 'Update' text link
Contact telephone number
Scroll down
To the Contact telephone number area
Click to 'On' as an optional field
Click 'On' as a required field (this is not recommended as it may result in the customer not completing the transaction)
'Off' is the default setting and what PayPal recommends
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