Returned directly or within a successful result object from the following requests:
The value that specifies the day of the month that the gateway will charge the subscription on every billing cycle.
The currency for the transaction (e.g. "USD" for US dollars). See the ISO 4217 codes.
The trial unit specified in a plan. Specify
month. Specifying a trial duration unit via the API will override the subscription's plan details.
A value indicating whether a subscription should begin with a trial period. Specifying a trial period via the API will override the subscription's plan details.