Create Checkout Plugin for WP WooCommerce

I need you to create a user friendly and easy to maintain Checkout plugin for my current site. The reason I need a custom plugin is that I have TWO payment plugins, Swish (Instant mobile pay) and Svea Chekoutout plugin (Invoce, Card Payments). These two Plugins does not work together by default in WP Checkout page, hence I need your help to make it work on a custom built plugin. Svea Checkout should be chosen by default when the customer gets to the Checkout page from the Cart or Directly to the checkout page. With Svea Checkout, the customer personal info does not need to be filled in, it is taken care by Svea Checkout by it self when get redirected to Svea Checkout. Check Attachment 1 When chosen, Swish, the customer info fields should be shown and filled in order to place an order. Please check Attachment 2 Place a realistic BID, I am not going to discuss and increase the bid after you place one. You should have experience of making plugins.