Adds a "Switch To" link to EDD Customer Details page --> Profile tab.

edd-switch-to-link.php

<?php

add_action( 'edd_customer_before_stats', 'edd_customer_switch_to_link' );
/**
 * Adds a "Switch To" link to EDD Customer Details page --> Profile tab.
 * Requires User Switching plugin.
 *
 * @author Ren Ventura <renventura.com>
 *
 * @param  object 	$customer 	EDD_Customer
 *
 * @return mixed 	False if no switch link, else void
 */
function edd_customer_switch_to_link( $customer ) {
	$user = new WP_User( $customer->user_id );
	$switch_to_link = class_exists( 'user_switching' ) && ! empty( $user->ID ) ? user_switching::maybe_switch_url( $user ) : false;
	if ( false === $switch_to_link ) {
		return;
	}
	?>
	<p id="switch_to_customer_link">
		<a href="<?php echo $switch_to_link; ?>">Switch To</a>
	</p>
	<script>
		jQuery(document).ready(function($) {
			// Stick the link below the customer avatar image
			$('#edit-customer').after($('#switch_to_customer_link'));
		});
	</script>
	<?php
}