Like many online banks, PayPal has an ACH transfer service that allows customers to transfer money to and from their linked bank accounts. This Consumerist article
describes the problems a woman is having after she used the wrong account for her linked Wells Fargo account. One usually has to confirm trial deposits when you want to link a bank account in PayPal. One of the commenters suggested that she may have linked the Wells Fargo account by sending PayPal a Wells Fargo statement rather than using trial deposits.