How do sell form sellers accept an offer and get paid?

On Launch, sellers do everything from your emails, with no account:

• Accepting the offer: the offer email has a Review your offer button that opens a page for that offer, where they pick a payout option and accept or decline. The link works until the offer itself expires.
• Getting paid: when you send a payout, the email has a link to add their payout details for that payout. They can only add the method you chose, and the link stops working when the payout expires, after 30 days or the shorter period you set.

On Pro and Enterprise, sellers who used the sell form create a Resale App account with the same email to accept their offer, and their submission is already there. If they never create one, they still add payout details from the link in the payout email.

See How does a customer accept an offer sent by the company they are selling to? and How do my customers connect their bank account to receive payouts?