1. A payment control apparatus at a remote subscriber station in a pay per view pay television system, comprising: means for descrambling a selected video program transmitted from a center to the remote subscriber station; means for decoding control data transmitted from said center, said control data including an advance deposit amount for each pay per view channel, a deposit date for each advance deposit amount, and program fee data for each channel and program; memory means for storing at least a last advance deposit amount for each of a plurality of channels, and the deposit date for each advance deposit amount; advance memory means for maintaining a current running balance for each channel; adding means connected to the advance memory means for increasing the running balance for each channel with each advance deposit amount for that channel; subtracting means connected to the advance memory means for subtracting the program fee data on a given channel when a program is received from the running balance for each such given channel; activating means connected to said memory means for activating said means for descrambling said selected video program after checking that the running balance is not below a predetermined amount on the channel corresponding to the selected program; means for comparing a deposit date of a new deposit amount and the deposit date of a last deposit amount to check validity of the new deposit amount; and means for simultaneously displaying upon viewer request each channel, the most recent deposit amount for each channel, the running balance for each channel, and the date of the most recent deposit amount for each channel.