# Create external campaign

**POST /v1/Services/PreregisteredUsa2p**


Resource to associate preregistered campaign with Messaging Service.

## Servers



## Parameters



### Body:  (object)

- **CampaignId** (string)
  ID of the preregistered campaign.
- **MessagingServiceSid** (string)
  The SID of the [Messaging Service](https://www.twilio.com/docs/messaging/services/api) that the resource is associated with.


## Responses
### 201
Created

#### Body:  (object)
- **account_sid** (string | null)
  The SID of the Account that created the resource
- **campaign_id** (string | null)
  ID of the preregistered campaign.
- **date_created** (string(date-time) | null)
  The ISO 8601 date and time in GMT when the resource was created
- **messaging_service_sid** (string | null)
  The SID of the Messaging Service the resource is associated with
- **sid** (string | null)
  The unique string that identifies a US A2P Compliance resource


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