get https://secure.vend-o.com/api/extend-subscription/
You can extend a subscription using this API. When called, the API updates the next rebill date or extends the subscription's expiration date
On successful extension a response 1 is returned, otherwise, the API returns one of the following errors:
| Response code | Description |
|---|---|
| 5929 | Signature is invalid |
| 5970 | Missing parameter: subscriptionId. |
| 5971 | Missing parameter: days |
| 5972 | Subscription not found. |
| 5973 | Subscription expired |