Website to sell customised digital product

I design custom templates for the Xero accounting platform and would like a website that allows customers to purchase them easily. I have my own server with Wordpress but would be happy to look at other options.

The user journey (and therefore functionality) needs to include:

1. User selects a design (we will start with 3 or 4 but I will want to add more later)
2. User specifies design customisations (eg. font from list, primary and secondary colour from colour picker, and uploads a logo)
3. User specifies additional options (series of checkboxes that they can turn on and off) and enters text for any terms.
4. User chooses the package they want (different options with different prices) and adds package to basket
5. User pays for order (we can use PayPal and/or Stripe checkout)
6. Order details are sent through to me so I can customise the template and send their package out to them (either by email as an attachment or by uploading to the site for them to download)

I hope that provides enough detail for you to submit proposals.

To ensure you’ve read this fully, please start your response with “Xero Custom Template Ordering System”.

UK freelancers only please. Budget specified is a placeholder.