# Create external campaign

**POST /v1/Services/PreregisteredUsa2p**


Resource to associate preregistered campaign with Messaging Service.

## Servers
- https://messaging.twilio.com: https://messaging.twilio.com ()


## Authentication methods
- Account sid auth token


## Parameters



### Body: application/x-www-form-urlencoded (object)

- **CampaignId** (string)
  ID of the preregistered campaign.
- **MessagingServiceSid** (string)
  The SID of the [Messaging Service](https://www.twilio.com/docs/messaging/api/service-resource) that the resource is associated with.
- **CnpMigration** (boolean)
  Customers should use this flag during the ERC registration process to indicate to Twilio that the campaign being registered is undergoing CNP migration. It is important for the user to first trigger the CNP migration process for said campaign in their CSP portal and have Twilio accept the sharing request, before making this api call.


## Responses
### 201
Created
#### Headers
- **Access-Control-Allow-Origin** (string)
  Specify the origin(s) allowed to access the resource
- **Access-Control-Allow-Methods** (string)
  Specify the HTTP methods allowed when accessing the resource
- **Access-Control-Allow-Headers** (string)
  Specify the headers allowed when accessing the resource
- **Access-Control-Allow-Credentials** (boolean)
  Indicates whether the browser should include credentials
- **Access-Control-Expose-Headers** (string)
  Headers exposed to the client

#### Body: application/json (object)
- **sid** (string | null)
  The unique string that identifies a US A2P Compliance resource `QE2c6890da8086d771620e9b13fadeba0b`.
- **account_sid** (string | null)
  The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that the Campaign belongs to.
- **campaign_id** (string | null)
  ID of the preregistered campaign.
- **messaging_service_sid** (string | null)
  The SID of the [Messaging Service](https://www.twilio.com/docs/messaging/api/service-resource) that the resource is associated with.
- **date_created** (string(date-time) | null)
  The date and time in GMT when the resource was created specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format.


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