Observer for invoice creation after it is saved

Question

I have tried the following events for invoice creation observer:

sales_order_invoice_save_after

sales_order_invoice_pay

sales_order_invoice_register

sales_order_invoice_save_commit_after

controller_action_postdispatch_sales_order_invoice_save

and in the observer I am calling:

$invoice = $observer->getEvent()->getInvoice();
$invoice_id = $item->getData('entity_id');

For all of the above events, the entity_id is received as null. Also the observer is called before there is a new entry in the database.

What is the correct event to get invoice id after it is saved?

Answer 1

check if it is not typo. using this event sales_order_invoice_register

replace

$invoice = $observer->getEvent()->getInvoice();
$invoice_id = $item->getData('entity_id');

with

$invoice = $observer->getEvent()->getInvoice();
$invoice_id = $invoice->getData('entity_id');