gistfile1.php

<?php
//add_action( 'wp_head', 'tgm_delete_all_orders' );
function tgm_delete_all_orders() {
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	$payments = get_posts( array( 'post_type' => 'edd_payment', 'posts_per_page' => -1, 'post_status' => 'any' ) );
	$downloads = get_posts( array( 'post_type' => 'download', 'posts_per_page' => -1 ) );
	
	if ( $downloads ) {
		foreach ( $downloads as $download ) {
			delete_post_meta( $download->ID, '_edd_download_sales' );
			delete_post_meta( $download->ID, '_edd_download_earnings' );
		}
	}
	
	if ( $payments )
		foreach ( $payments as $payment )
			wp_delete_post( $payment->ID, true );
	
}