BigCommerce pass order variables

I am looking to add a new payment option on my ecommerce site and I want to pass customer order details in the order instruction when an order is made. So a customer will shop, checkout and land on the success page - in that page they will see a link as follows <a href="/first_name=XXX&last_name=XXX&order_id=XXXamount=XXX">Pay Now</> On XXX there needs to be customers details depending on each order; Please find the following variables 1. First & Last Name 2. Email Address 3. Order ID 4. Order Total (preferably just number) 5. Success URL 6. Cancel URL 7. Mobile or Cell Number