Invoice is an element of the Magento order processing that is as important as the order itself. An invoice is a document that signifies the "agreement" between a store and a person and contains all of the order details.
Usually, order invoices in Magento 2 are created automatically, once the payment was authorized or captured by the store. However, there are cases when you need to create an invoice programmatically in Magento 2.
This is just the case. We will show you how to do this is in just 1 step: