Cancels one particular saved subscription with specific subscription ID.Subscription plan has to be added and saved beforehand. Within a single subscription plan, one product can be included (one plan, one product). There can be multiple plans for the same product. The plans can differ by some parameters such as trial period, fee charge day, activation fee, amount, currency, interval count or interval unit etc.If the Merchant cancel the subscription plan that customer is actively using, the customer' subscription will automatically expire at the end of the billing period.
