post https://public.billsby.com/api/v1/rest/core//customers//subscriptions
You can use this API to add a subscription to an existing customer. As each customer can only have one plan, the customer must not have any other plans associated with their account when you use this.
Returned variables
| Variable name | Description |
|---|---|
| customerUniqueId | The unique identifier of the customer in the Billsby platform |
| subscriptionUniqueId | The unique identifier of the subscription in the Billsby platform |