Every licensee shall maintain a lock box in New York State where borrowers may mail payments of principal, interest or other charges. Every person granted a loan must be informed, in writing, of this at the time the loan is granted. Payments from borrowers must be credited to the borrower's account as of the day the payment is received at the lock box if this is a business day or, if received on other than a business day, payment must be credited on the first business day thereafter.