period

Length of purchase. The unit of duration is determined by the 'period_unit' parameter. Default value: 1.

• When the period_unit parameter is set to Month, the valid values are 1, 2, 3, 4, 5, 6, 7, 8, and 9.

• When the period_unit parameter is set to Year, the valid values are 1, 2, 3, 4, and 5.