How are the other methods you listed "in writing"?
1. Payment requirements. The servicer may specify reasonable requirements for making payments in writing, such as requiring that payments be accompanied by the account number or payment coupon; setting a cut-off hour for payment to be received, or setting different hours for payment by mail and payments made in person; specifying that only checks or money orders should be sent by mail; specifying that payment is to be made in U.S. dollars; or specifying one particular address for receiving payments, such as a post office box.
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