Using paypal data to dynamically populate contact field

This sounds more convoluted than i think it is. I just didn't know how to dscribe what I need. Here's what I'm trying to do.
1. User completes a purchase form with Paypal and User Registration add-ons.
2. User is sent to Paypal to complete the transaction
3. User is sent back to a new form to finish the process by uploading photos. This form should be pre-populated with their user info (name, username, and or email).

Can I do that with little to no coding?

I could have the photo upload as part of the original form; however, for an easier, smoother user experience, I'd like to be able do it in the method above. I'm not a programmer, so if this require more than a minimal amount of coding, I guess I'll have to do it all on one form.

Thanks

I could go either way really. I guess file upload would be the truest function since I'm not ultimately making posts. I'm just downloading the photos to create actual printed photo galleries. I thought perhaps using the post image method, I might be able to devise a way for each customer to view the images they have submitted or perhaps install some sort of plugin that would allow the user to arrange them in a grid... but I digress.