- $result = subs_subscribe_to($this->user, $this->other);
-
- if (is_string($result)) {
- $this->clientError($result, 403, $this->format);
- return;
+ try {
+ Subscription::start($this->scoped, $this->other);
+ } catch (AlreadyFulfilledException $e) {
+ $this->clientError($e->getMessage(), 409);