Simple website Selling Cryptos

I need a simple website made where users can select 1 of 4 crypto currencies, Bitcoin (BTC), Bitcoin Cash (BCH), Ethereum (ETH), and Litecoin (LTC). User inputs about of USD worth they want to buy, so if user wants to by $5 USD worth, it converts it to the amount in the desired currency ex: .00095 BTC or ETH. Then click continue, next page has Name, first and last, phone #, address, and Wallet ID, then continue to checkout. Checkout will be Send money as friend or family Paypal. This will help ensure me of no chargebacks. Payment completed then gets pushed back to site where they are given the transaction ID for purchase and thank you. No need more user register or log in. I would like a few simple things to be added such as enter a percent for processing fee where i can make a small percent off the sale. If percent is set to %5 and user spends $100 I get $5 and total fee for the order. The prices can be pulled from anythere who offers crypto pricing API. The site can be done in simple PHP, 3 pages big, perhaps a config file where I can enter a % for fees for each currency. Once order is completed at the thank you page, send email to person with email provided saying thank you for the order, I can add the content for email. Design can be a simple free temple I can provide. Please do not big if you are going to charge a large number, this project should take no more the 4 hours if you are familiar with PHP and paypal API.