# Registration routes: admit, approve, attend

URL: /code/api/registration/verbs · Id: `page:code/api/registration/verbs`

> The Registration Verbs admit, approve, attend as api.sb routes, with inputs, result, refusals and an example.

Reference for [Registration](/business/nouns/registration), one group of [Registration routes](/code/api/registration).

### Registration.admit
Admit gives the next Contact in line a place at a Gathering when one frees up or its capacity rises. [Verb page](/business/nouns/registration/admit?interface=api).

```text
POST /{namespace}/registrations/{registration}/admit
```

Path: `registration`. Emits [`Registration.admitted`](/business/events/Registration.admitted).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The waitlisted Registration. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The Registration, now `registered`. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |
| The Gathering is at capacity | [`refused`](/code/api/errors/refused) | Clear what the check names, then call it again. | None. |

**Example**

```bash
curl -X POST https://api.sb/leaseline.app/registrations/registration_95lvb7R17L/admit \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "registration": {
    "$id": "https://api.sb/leaseline.app/registrations/registration_95lvb7R17L",
    "$type": "Registration",
    "status": "invited"
  },
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/act_br07HsG8MG",
    "operation": "Registration.admit",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/leaseline.app/actions/act_br07HsG8MG"
  }
}
```

### Registration.approve
Approve gives a requested place at a Gathering to the Contact who asked, or a place in line when the Gathering is full. [Verb page](/business/nouns/registration/approve?interface=api).

```text
POST /{namespace}/registrations/{registration}/approve
```

Path: `registration`. Emits [`Registration.approved`](/business/events/Registration.approved).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The requested Registration. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The Registration, `registered` or `waitlisted`. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```bash
curl -X POST https://api.sb/leaseline.app/registrations/registration_95lvb7R17L/approve \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "registration": {
    "$id": "https://api.sb/leaseline.app/registrations/registration_95lvb7R17L",
    "$type": "Registration",
    "status": "invited"
  },
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/act_br07HsG8MG",
    "operation": "Registration.approve",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/leaseline.app/actions/act_br07HsG8MG"
  }
}
```

### Registration.attend
Attend records that a registered Contact joined the Gathering; an online room calls it on join. [Verb page](/business/nouns/registration/attend?interface=api).

```text
POST /{namespace}/registrations/{registration}/attend
```

Path: `registration`. Emits [`Registration.attended`](/business/events/Registration.attended).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The Registration of the Contact who joined. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `registration` | [Registration](/business/nouns/registration) | Yes | The Registration, now `attended`. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```bash
curl -X POST https://api.sb/leaseline.app/registrations/registration_95lvb7R17L/attend \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "registration": {
    "$id": "https://api.sb/leaseline.app/registrations/registration_95lvb7R17L",
    "$type": "Registration",
    "status": "attended"
  },
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/act_br07HsG8MG",
    "operation": "Registration.attend",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/leaseline.app/actions/act_br07HsG8MG"
  }
}
```