Delete a plan 

Deleting plans means new subscribers can’t be added. Existing subscribers aren’t affected.

Parameters

No parameters.

Returns

An object with the deleted plan’s ID and a deleted flag upon success. Otherwise, this call raises an error, such as if the plan has already been deleted.

DELETE /v1/plans/:id
curl -X DELETE https://api.stripe.com/v1/plans/plan_NjpIbv3g3ZibnD \
-u "sk_test_BQokikJ...2HlWgH4olfQ2sk_test_BQokikJOvBiI2HlWgH4olfQ2:"
Response
{
"id": "plan_NjpIbv3g3ZibnD",
"object": "plan",
"deleted": true
}

Quote 

A Quote is a way to model prices that you’d like to provide to a customer. Once accepted, it will automatically create an invoice, subscription or subscription schedule.

Subscription Items 

Subscription items allow you to create customer subscriptions with more than one plan, making it easy to represent complex billing relationships.

Subscription Schedule