Wordpress plugin to manage payment from one site to another

We need a Wordpress & WooCommerce plugin which will send customers from one site to another to pay and then back to the first site. For example... A customer will browse on SiteA pick an item and add it to their cart, once that customers presses 'Checkout' they will be redirected to SiteB which will be a completely different domain and they will fill out the WooCommerce checkout page (name, address, email etc) once they have paid for the item they will then be redirected back to SiteA and be presented with the 'Order Confirmation page'. In the background they system will work exactly the same as if it was on one website, coupons will work fine and the customer will be signed up for both websites where their password will either be auto-generated or they will use the same one they created on the checkout page. The reason for this is because we will have our main website which will sell different products 'SiteA' and the second website will be a subscription-based site where if they selected Y product on 'SiteA' and it matches the subscription item on SiteB they will also have a monthly recurring payment - but our payment processor will charge us twice for different websites. Please ensure you have fully read the brief as auto bids will be rejected instantly. Also feel free to ask me some questions within your bid so I know you have read this.