First button in upsell flow
* This is the main / first button in the upsell flow
* This button can be for a subscription product or a one-time-purchase product
* When a user clicks on this button, the buyer is redirected to the paypal page
* Buyer puts in their paypal email id and password to authenticate to paypal
* Buyer's main/first order is added-to-cart and the buyer is now redirected back to the 'first upsell page' in the flow
* Buyer can now click on the upsell button on the upsell page (you can generate the upsell buttons right on this page - check step 3 below) OR click on 'no thanks' button on upsell page (you can generate that 'no thanks' button right on this page - check step 3 below)
* Buyer clicks on upsell button and the upsell order is added to cart. User will NOT get transferred to paypal again.
* If the upsell button is configured for more upsells, then the buyer will be transferred to next upsell page.
* If it's the last upsell OR if the buyer clicks on 'no, thanks' button, the buyer will land on 'final summary' page where the buyer can VIEW all items added-to-cart.
* Buyer clicks on 'Final Checkout' button and the purchase transaction is now completed.
* DAP automatically creates the member account, logs in the user to their membership area, and sends thankyou email with login info to the buyer
* After purchase, the Buyer will be redirected to whatever you set as the Payment Success Page when you configure the 'final summary' page. If you didnot set one, then the buyer will be redirected to 'Post-Login-Redirect' URL configured in DAP.