How Would I Do This?

I’m offering a service where I’ll do something like put a bunch of pictures together for a person but to get to this point is where I’m confused. At the bottom of my page I have 3 different payment options and there is an “Order Now!” button… for what I’m trying to do the best thing I can think of would go like this

Order Now Button ->Paypal (Debit/CC Entered) -> File Upload Form -> Email until service is complete.

Is there a better way to do this?

What’s wrong with the flow you’re proposing?