Email hello@gift.directory. We read everything and usually answer within two business days.
An order from a retailer (shipping, returns, a wrong item): the retailer you bought from handles the order. Their contact details are on their site and in your order confirmation.
A group-gift payment: contributions go straight to the organizer's PayPal account. For a refund, ask the organizer. For a problem with a payment itself, PayPal's Resolution Center can help.
Your store or subscription: log in at gift.directory/admin with the PayPal account that pays for the store. You can cancel the subscription any time in PayPal.