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Hello,
I own a music e-commerce website where I sell instrumentals and other services. On my site, I offer different leases aka different packages that people can choose from.
Right now, there is no option to upgrade a package after someone has already purchased one. I was wondering how to implement a function that lets a user upgrade to the next package when they are ready to, and only have to pay the difference in price between the packages?
For example: our bronze level lease is $40.00 and our silver level lease is $60.00. if someone has already purchased bronze and wants to upgrade to silver, they would only have to pay the difference of $20.00.
Any help is appreciated!
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