# Manually Triggering Subscriptions

Re-Triggering Subscriptions requires the
[FHIR\_TRIGGER\_SUBSCRIPTION](/content/docs/security/roles_and_permissions.html#FHIR_TRIGGER_SUBSCRIPTION/index.html) permission.

It is sometimes desirable to have a Subscription "trigger" for a specific resource. This concept is easiest to explain with an example:

Suppose a REST HOOK subscription `Subscription/123` exists with criteria `Observation?status=complete`. When an Observation is created with the given status, the subscription will deliver a notification to its intended target. Now suppose you want to manually cause your Observation to be processed a second time (and ultimately re-delivered, assuming it still matches the Subscription criteria) without modifying the Observation.

The `$trigger-subscription` operation can be useful in order to cause this subsequent "triggering" to occur.

## Triggering a Resource by ID

In order to cause `Observation/6` to be triggered for `Subscription/123`, the following Parameters resource should be crafted as an operation parameter. Multiple IDs may be specified using multiple parameter repetitions.

```json
{
  "resourceType": "Parameters",
  "parameter": [\
    {\
      "name": "resourceId",\
      "valueUri": "Observation/6"\
    }\
  ]
}
```

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## Triggering a Larger Set of Resources

Instead of individual resource IDs, a search URL may be used to request a group of resources to be triggered.

```json
{
  "resourceType": "Parameters",
  "parameter": [\
    {\
      "name": "searchUrl",\
      "valueString": "Observation?date=2018-10-16"\
    }\
  ]
}
```

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## Executing

This Parameters resource is then POSTed to the FHIR endpoint via a URL such as the following (the following triggers the resource for the subscription `Subscription/123`):
[http://localhost:8000/Subscription/123/$trigger-subscription](http://localhost:8000/Subscription/123/$trigger-subscription)

This Parameters resource may also be POSTed to the Subscription type (instead of an individual Subscription) in order to trigger the resource to all active Subscriptions for which it matches:
[http://localhost:8000/Subscription/$trigger-subscription](http://localhost:8000/Subscription/$trigger-subscription)

[Delivery Options](/content/docs/subscription/delivery.html)

Manual Triggering

Subscription

[Introduction](/content/docs/subscription/introduction.html)
[Architecture](/content/docs/subscription/architecture.html)
[Channel Types](/content/docs/subscription/channels.html)
[Delivery Options](/content/docs/subscription/delivery.html)
[Manual Triggering](/content/docs/subscription/manual_triggering.html)
[Topic Subscriptions](/content/docs/subscription/topic.html)

[Topic Subscriptions](/content/docs/subscription/topic.html)