PreviewAttachFreeTrial

Fields

Field	Type	Required	Description
`duration_length`	float	✔️	Number of duration_type periods the trial lasts.
`duration_type`	Optional[models.PreviewAttachDurationType]	➖	Unit of time for the trial ('day', 'month', 'year').
`card_required`	Optional[bool]	➖	If true, payment method required to start trial. Customer is charged after trial ends.