Hi @Bcaff,
I'm sorry to hear that your father is unable to pay a payment request that you've sent to him. This can happen for a few reasons, up to and including the possibility that the security system is declining the payment due to some risk that has been perceived. If the problem persists when the payment is tried at a later date, please ask your father to reach out to customer service for some troubleshooting.
To contact customer service, please click Contact at the bottom of the PayPal website for available options, or reach out by PM on Facebook or DM on Twitter.
I hope this can be resolved quickly!
Olivia
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