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WC customising checkout fields using actions and filters - Lesson 3 snippet 3
/**
* Update the order meta with field value
*/
add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );
function my_custom_checkout_field_update_order_meta( $order_id ) {
if ( ! empty( $_POST['my_field_name'] ) ) {
update_post_meta( $order_id, 'My Field', sanitize_text_field( $_POST['my_field_name'] ) );
}
}

Suggestion for WC3.0+

/**
 * Update the order meta with field value
 */
add_action( 'woocommerce_checkout_create_order', 'my_custom_checkout_field_update_order_meta' );

function my_custom_checkout_field_update_order_meta( $order ) {
    if ( ! empty( $_POST['my_field_name'] ) ) {
        $order->update_meta_data( '_my_field', sanitize_text_field( $_POST['my_field_name'] ) );
    }
}
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