For international shipping: What should our return and payment policy be? Do we need to leave more time for returns?
Returns and payments should have the same policies as your local shipping option- nothing special needed.
For instance, 30 day returns, no restocking fee, seller pays return shipping on defects- buyer on returns because he no longer wants item.
Payment should be immediate payment and using PayPal.
The return countdown starts from when the buyer receives the item, so there is no need to extend it beyond 30 days.