Creates a pricing plan. The specified plan object must contain a pricing model. A pricing model can be 1 of the following:
A subscription: A subscription with recurring payments and how often the plan occurs. Subscriptions can have free trial days.
A plan that doesn't renew: A single payment for a specific duration that doesn't renew.
An unlimited plan: A single payment for an unlimited amount of time (until canceled).
Pricing plans are available to the Wix user in the Pricing Plans section in a site's dashboard.
Authentication
You can only call this method when authenticated as a Wix app or Wix user identity.