docs: add default value to state param

Author: stfsy

lib/paddle/api.js

@@ -15,6 +15,7 @@ const VERSION_2 = '2.0'
 const PATH_CANCEL_SUBSCRIPTION = `${VERSION_2}/subscription/users_cancel`
 const PATH_LIST_USERS = `${VERSION_2}/subscription/users`
 const PATH_LIST_PLANS = `${VERSION_2}/subscription/plans`
+const PATH_LIST_PAYMENTS = `${VERSION_2}/subscription/payments`
 const PATH_UPDATE_USERS = `${VERSION_2}/subscription/users/update`
 const PATH_LIST_PRODUCTS = `${VERSION_2}/product/get_products`
 const PATH_GET_ORDER = `${VERSION_1}/order`
@@ -89,7 +90,7 @@ module.exports = class {
      * Note: Returns all active, past_due, trialing and paused subscription 
      * plans if not specified. 
      * 
-     * @param {String} state list only subscriptions with given state. Lists only active subs by default.
+     * @param {String} [state='active'] list only subscriptions with given state. Lists only active subs by default.
      * @param {Number} perPage limit the response to a certain number of results
      * @returns 
      */