Custom plugin to extend WooCommerce Subscriptions extension

We need a plugin to extend the WooCommerce Subscriptions extension's funcitonality. ( URL to extension: [login to view URL] ) . Extension documentation: [login to view URL] Needed features: 1. When a customer orders a new subscription product, he will be able to choose which date the subscription should start at. The dates he can select from are already set in the subscription details in the WooCommerce product view backend. 2. After completing the purchase, the customer should be able to schedule his subscription to be put "on-hold" from a calendar, listing all upcoming subscription dates (payment dates). He can choose any of these dates and mark that he wish to put his subscription "on-hold". Requirement: The dates must be 7 days ahead of current time . (This requirement need to be an adjustable setting on a plugin page so that the required number of day , if any, can be easily adjusted. Example: today is August 24th. I want to pause my subscription which is due tomorrow. This is impossible / not allowed as it is less than one week from now. The first date I will be able to pause the subscription is today + 7 days. 3. All functionality should be kept in a stand-alone plugin. The only requirements should be that WooCommerce and WooCommerce Subscriptions plugin exist in the current Wordpress installation. All code and functions are to be provided with GOOD documentation. The plugin is to be written as one or more classes. We expect you to be well experienced in OOP. 4. No payment should be processed any of the dates the subscription is set to be put on-hold in this scheduler. Short info about the subscription products this is supposed to handle: All products are food packages which are delivered to customers at their homes. The subscribe to various packages of food. The products are variable subscriptions in WooCommerce where they choose how many meals they wish to recieve..and how many times pr. month / pr. week etc. Sometimes the customers know that they are on holiday for example..and therefore they need to set their subscription "on-hold" so that delieveries are not coming these days. The food delievery company need a notice of this atleast 7 days ahead of time..therefore the requirement mentioned above on paragraph # 2. If we are happy with your work, you are likely to recieve more projects from us. We need this project completed as soon as possible, it's very urgent.