Paying for Listing fees:
Established Business listing fees can be paid for using all major debit and credit cards. App, Domain and Starter/Template Website listing fees can be paid for using both debit and credit cards or PayPal.
Paying for Listings:
For transactions with a value of less than $1000, PayPal can be used for payment from the Sale Completion Area or from the listing page if the seller has enabled this. Both the Buyer and Seller need to complete ID verification before this option is available.
For all other transactions regardless of the price, Escrow.com can be used for payment from the Sale Completion Area. This also requires both the Buyer and Seller completing Flippa's ID verification (link to the ID article). More information can be found on Escrow.com (link to the article that Stefan is creating about Escrow.com).
Paying for Success fees:
All Success fees can be paid for using both PayPal and credit/debit cards.