What is your selling process?

[Bill]

My friend is an artist outside US and wants to sell her art on your site.
She has a PayPal account but no credit card. Can she pay you the $24 fee through PayPal?
What is the selling process?
The buyer pays you first with a credit card, and when he/she receives the artwork, you pay the seller through PayPal or send him/her a check?
Do you charge any commission?
What is the return policy?
If the buyer returns an artwork, who pays the shipping costs both ways?

Bill
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