Create plan

A request to create a new plan.
A plan is the basis for a contract with recurring payments. It is not assigned to a specific debtorId and can be used across multiple contracts like a template. After a contract is assigned to a plan with phases and options, usages are created which result in billable items for the debtor.
Creating options while creating a plan is deprecated: Use the Option API instead to manage Options and reference them when creating a plan.