Using this plugin you can send the invoice PDF automatically with the order confirmation mail sent to the customer.

acespritech

The ASPL Email PDF Invoice facilitates the invoice pdf generation and the download from the order page for the admin and user and email it with woocommerce order email.
Features:- 
1) Automatically attach invoice PDF to WooCommerce emails. 
2) Show / Download the order PDF invoice from the order admin page and user can download it from my-account order page 
3) It’s work on order status update.

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