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I had wanted to link the PayPal Debit MC to my PayPal Credit CL (formerly BIll Me Later) but it isn't possible.
The only backup options listed are my checking acct or to apply for PayPal Extras, which I can't do b/c of their one prouduct rule.

You can link it to Pay Pal Smart Connect but not Bill Me Later
I like PayPal Credit b/c it's a hidden TL. I have $5K available credit on it.
I closed my Smart Connect yrs ago.