billing frequency

Code	Description
01	1 delivery
02	2 deliveries
03	3 deliveries
etc.
A0	100 deliveries
A1	101 deliveries
A2	102 deliveries
A3	103 deliveries
etc.
B0	110 deliveries
J1	1 year
J2	2 years
J3	3 years
M1	1 Month
M2	2 Months
M3	3 Months
M4	4 Months