Updates an existing webhook subscription.
 Endpoint
 https://api.neoncrm.com/neonws/services/api/webhook/updateWebhook
 Request
 https://api.neoncrm.com/neonws/services/api/webhook/updateWebhook?webhook.id=27&webhook.webhookName=My%20Test%20Webhook&userSessionId=[session id]
 Response
 { "updateWebhookResponse": { "operationResult": "SUCCESS", "responseDateTime": "2017-06-30T19:42:18.494+0000", "id": 27 } } 
 Request Parameters
    | Parameter | Required | Description | 
    | webhook.id | Yes | The ID of the webhook to be updated. | 
  | webhook.webhookName |  | The internal name for this webhook. | 
  | webhook.notifyUrl |  | The URL to which the webhook POST will be sent. | 
  | webhook.eventTrigger |  | The event in NeonCRM that triggers the sending of the webhook POST. Possible values: CREATE_ACCOUNT, UPDATE_ACCOUNT, DELETE_ACCOUNT, CREATE_DONATION, UPDATE_DONATION, DELETE_DONATION, CREATE_MEMBERSHIP, UPDATE_MEMBERSHIP, DELETE_MEMBERSHIP, CREATE_ACTIVITY, UPDATE_ACTIVITY, DELETE_ACTIVITY. | 
  | webhook.contentType |  | Possible values: application/x-www-form-urlencoded, application/json. If application/x-www-form-urlencoded, the data will be sent as a JSON string in a form parameter called “payload”. | 
  | webhook.userName |  | If your webhook uses HTTP basic authentication, provide a user name here. | 
  | webhook.password |  | If your webhook uses HTTP basic authentication, provide a password here. | 
  | webhook.parameters.nameValuePair.name |  | Provide the name for a custom parameter to be included with all webhook POSTs. This field is repeatable. | 
  | webhook.parameters.nameValuePair.value |  | Provide the value for a custom parameter to be included with all webhook POSTs. This field is repeatable. | 
  
 Response Parameters
    | Parameter | Description | 
    | id | The ID of the webhook that was updated. | 
  
 Error Codes
    | Code | Text | Description | 
    | 17007 | WEBHOOK_ID_IS_REQUIRED | Webhook id is required. | 
  | 17008 | WEBHOOK_ID_IS_INVALID | Webhook id is invalid. | 
  | 17005 | NOTIFY_URL_IS_INVALID | Notify URL is invalid. | 
  | 17006 | CONTENT_TYPE_IS_INVALID | Content type is invalid. |