Question Regarding Expiration

For recurring payments what is important is the:
Billing Amount: $ per however many days/months/etc.
Billing Cycle Limit: how many times will this amount be billed?
Custom Trial: will there a special priced trial for the first billing period, for example.

Expiration can be used for non-recurring purchases, such as a one time membership for a period of 1 year.

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