Send Order Confirmation automatically to customer’s mobile number

This is an e-commerce plugin called Woocommerce, you need to read up on their hooks, such as woocommerce_new_order here. The code you pasted would usually go inside the active theme’s functions.php. All the themes are located in wp-content/themes, you can easily check which theme is active in the admin dashboard under Appearance -> Themes in the left-side menu.

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