code: func (r *EchoResponse) LinkAccountCard() *EchoResponse {
  	r.Response.Card = &EchoRespPayload{
  		Type: "LinkAccount",
  	}
  
  	return r
  }
docs: // LinkAccountCard is used to indicate that account linking still needs to be completed to continue
  // using the Alexa skill. This will force an account linking card to be shown in the user's companion app.