Websites and app to be built with purchase access using fiat and crypto currency

I'm looking to have several webpages and an app to be built.

1: A home page with the list of what's available to purchase from our clients.

2:A purchase page for crypto currency and credit card

3: (optional) A conversion page to turn purchase amoun, into in house token/crypto coin.

4: An app that can join these pages together
Location: Worldwide