Some sites accept prepaid cards which you can sometimes purchase using PayPal at authorized digital retailers.
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Since direct PayPal integration is rare for adult-themed classifieds, you can use PayPal to facilitate payments indirectly: Some sites accept prepaid cards which you can
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It is no longer possible to buy credits for Backpage, as the site was by federal law enforcement in 2018. Any site currently claiming to be "Backpage" and asking for PayPal payments is likely a scam or an unrelated imitation.