EDD Admin-Only Test Payments

add_filter( 'edd_enabled_payment_gateways',  'kws_edd_enabled_payment_gateways');

/**
 * Modify the gateways for users who can manage options so that the Test Payment gateway is activated.
 * See /easy-digital-downloads/includes/gateways/functions.php
 * @see  edd_get_enabled_payment_gateways()
 * @param  array  $gateways Existing activated gateways array
 * @return array           Modified array
 */
function kws_edd_enabled_payment_gateways($gateway_list) {
	global $edd_options,$current_user;

	// Is the current user admin?
	if(current_user_can( 'manage_options' )) {
		$gateway_list['manual'] = array(
			'admin_label'    => __( 'Test Payment (Admin-Only)', 'edd' ),
			'checkout_label' => __( 'Test Payment (Admin-Only)', 'edd' )
		);
	}
	// If the current user's not admin, remove the Test Payment option
	else {
		unset($gateway_list['manual']);
	}
	
	return $gateway_list;
}