I am working on this Magento 2 extension and part of the features is need to entry in another table where order total will be inserted. so what I need is to find order invoice status paid event observer.How can I get order invoice status paid event in observer?
Here is the list of Magento 2 events.
In your case you can use
sales_order_invoice_pay event which is calling from below location inside pay() function.
$this->_eventManager->dispatch('sales_order_invoice_pay', [$this->_eventObject => $this]);