We are going to use the SMS upgrade system.
How it works is this...
A person buys the main product on our subaccount 2.
Upon successful purchase they are redirected to a page similar to this... (wordpress page)
[url removed, login to view] to be shown a special offer to upgrade.
Which the product is actually contained on subaccount 3 (upgrade)
If they click the YES button they are charged for the upgraded product and redirected then to the registration page.
The basic button code is...
No Thanks I Would Rather Go It Alone And Pass On This Special Offer
As you can see the subscription ID will have to be passed to this page and the redirect upon successful purchase will be set.
4 freelancers are bidding on average $226 for this job
Hello, I've reviewed the information provided and it's really similar to a projected I did which was using OneBip, a Mobile Payment Gateway, so I'm sure I will be able to do that really fast for you.
We are a team of SMS and Voice based website Expert Please check our company website: [url removed, login to view] We developed the similar applications before. Please check your PMB