In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: Booking opens for Beckett Shorts on September . BY TELEPHONE For credit card booking. Calls are answered . BOX OFFICE 01789 295623 9 a.m.~ 8 p.m. (Mon.~ Sat) 0541 541051 (24 hours , 7 days , no booking charge ) BY FAX For credit card booking . Please allow at least 48 hours for reply , if required. BOX OFFICE 01789 261974 or 01862 387765 BY POST Please enclose a cheque or credit card details together with an SAE or add 50 p to the total amount to cover postage. Please send to the Box Office , RST, Stratford-upon-Avon , CV37 6BB.
Answer: By post .
In which of the following ways of booking does one probably have to pay extra money ?