How to add duration period with plan?

I have created a plan using https://payments.pabbly.com/api/v1/plan/create this API. My question is how we can add the duration period with a plan. Suppose if I want to create a plan for 1 month, 15 days, or for one week.

Thanks in advance :)

Hey Manpreet,
For your concern, we request you to please follow this - https://apidocs.pabbly.com/#039094b9-417b-4f79-9f6e-baa9fcf95074