For every single of operation on the entities use the following templates and provide sample REST notification POST calls.
It is assumed that the Pub/Sub uses the Register and UnRegister mechanisms described in the REST Guidelines reproduced below.

REGISTER LISTENER POST for customerManagement

Description : 
Sets the communication endpoint address the service instance must use to deliver information about its health state, execution state, failures and metrics. Subsequent POST calls will be rejected by the service if it does not support multiple listeners. In this case DELETE /api/hub/{id} must be called before an endpoint can be created again.
Behavior :

• Returns HTTP/1.1 status code 204 if the request was successful.

• Returns HTTP/1.1 status code 409 if request is not successful.

  REQUEST

  POST /customerManagement/customer/hub Accept: application/json {"callback": "http://in.listener.com"}

  RESPONSE

  Status:201 Content-Type: application/json Content-Location: http://serverlocation:port/customerManagement/customer/hub/42 {"id":"42","callback":"http://in.listener.com","query":null}

  REQUEST

  POST /customerManagement/customerAccount/hub Accept: application/json {"callback": "http://in.listener.com"}

  RESPONSE

  Status:201 Content-Type: application/json Content-Location: http://serverlocation:port/customerManagement/customerAccount/hub/42 {"id":"42","callback":"http://in.listener.com","query":null}

  REQUEST

  POST /customerManagement/paymentMean/hub Accept: application/json {"callback": "http://in.listener.com"}

  RESPONSE

  Status:201 Content-Type: application/json Content-Location: http://serverlocation:port/customerManagement/paymentMean/hub/42 {"id":"42","callback":"http://in.listener.com","query":null}

  UNREGISTER LISTENER DELETE customermanagment/customeraccount/hub/{id}

  Clears the communication endpoint address that was set by creating the Hub.
  Behavior:
• Returns HTTP/1.1 status code 204 if the request was successful.
• Returns HTTP/1.1 status code 404 if the resource is not found.

DELETE customer hub

DELETE customer account hub

DELETE payment mean hub