WooCommerce Checkout Integrations, and Functionality Improvements

We need someone to perform 3 core tasks for us: --- TASK 1: We need someone to integrate and test four payment gateways with our WooCommerce/Wordpress based shopping cart, which is used for the purpose of selling digital subscriptions. The four payment gateways we require are - PayPal by Subscriptio - Stripe by Subscriptio - Bitpay - Amazon Payments Advanced All four of these gateways have been integrated into our shopping cart and configured, but are producing errors. We need a person with experience with these systems to fix their integrations, and guide us through the process of getting the necessary API keys and setup with Amazon and PayPal. --- TASK 2 In addition, we need to have the system modified slightly to know the difference between a customer which has never paid for a subscription, and a customer who has paid for a subscription but let their subscription expire. --- TASK 3 We need some minor modifications to the shopping cart and user registration process: - Clean up an issue regarding autofilling not updating the page properly. - Clean up a login message which uses default Woo-Commerce notifications and breaks our theme. - Fix an issue where refreshing the checkout page creates display errors. - Password strength indicator during registration - Modification to checkout page to better illustrate the requirement of choosing a payment option.