Creates a subscription plan.
Plan name. Value consists of pairs “localization”:“plan name”.
Subscription plan ID.
Plan external ID (32 characters).
Plan description. Value consists of pairs “localization”:“plan description”.
Group ID the plan is linked to.
Subscription expiration details.
Trial period details.
Grace period details.
Billing retry details.
Period of time that user can refund the payment for a subscription plan (in days).