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The flash Pay ID won't be found with the PayPal prepaid cards. It's an entirely different service. PayPal has never promoted flashpay as part of their Prepaid card services and the only feature/function associated to Netspend is the ability to add funds to your PayPal prepaid card(s) through the Netspend network.
According to this page, at the bottom, flash pay is only available for those brands. No mention of PayPal.