Add-on Script Project - Click2sell.eu API for DLguard

Add-on script Project I want to create a hybrid product on [login to view URL] Their API page is right here [login to view URL] The hybrid product will be a combination of 2 products: 1 digital product + 1 physical product. Digital Product The digital product is downloadable and will be paid for ONCE. Here is the URL to the digital product sales page = [login to view URL] The physical Product The physical product(s) is/are upsell(s). Here is the URL of the physical product sales page = [login to view URL] There are 2 checkout possibilities for the physical supplement. One time payment for 3bottles Subscription payments for either 1bottle every month or 3bottles every quarter **************************************************************************************** **************************************************************************************** This is how I need the sales funnel to flow. Step 1 Customer buys the digital downloadable product from the sales page ie landing page = [login to view URL] On this sales page, I want the buyer to click the “buy now” button and fully pay for the digital product. Probably paypal or credit card checkout ************************ ************************ IMPORTANT****It is as-of-this point forward that I need the add-on script ************************ ************************ It is imperative that the buyer pays for the digital product first. And only after the payment of the digital product has been processed, should be customer be re-directed to the “intermediate page = upsell page = [login to view URL]” Step 2 The intermediate page/upsell page must be displayed to all customers The page has to be displayed immediately after customer checks-out from buying the digital product On this “intermediate page”, I’ll give the buyer the option to go straight to the “thank you” page for the digital product or add the physical supplements. Please Note The thank you page is generate by dlguard [login to view URL] dlguard = [login to view URL] is a link protection software When a sale occurs, dlguard displays a thank you page with a unique download link and unique purchase receipt number What must the add-script do? It needs to take the sales info from [login to view URL] thanks to the click2sell API and pass it over to dlguard. The add-script must fulfill this function in both scenarios: Scenario 1: Customer buys only digital product Scenario 2: After buying digital product, customer also buys physical product The download/thank you page for the digital product = thank you page for physical product. There is no separate thank you page for physical product. Please see attachment The post exceeds the freelancer-allowed word count.