Coupon plus full price covered application

Legally code this add site add on for WordPress:

1× Reface my friends checkout cart and billing page with:

1x Basic invoice

1x percentage discount coupon code plus full fee covered

% discount coupon codes plus full price covered application:

40% off discount full price covered software installation. With setup testing and deployment.

You or your team are hired to legally put together:

1x Basic invoice on a website.

1x 40% discount for customers each checkout

1× 40% discount fee covered for seller, and

1x Instant direct deposit to sellers cash app the same day..

For ex: How should the % discount coupon codes plus full price covered application work: If I the customer pay with an universal pay card of $100 for a product on the site, in checkout, I spend only $60 for full cost instead. Then the website Owner receives the full $100 payment for the successfull paid transaction, and withdrawal it to his cash app instantly.

The % discount coupon codes plus full price covered application should also cover the discount fee.

You will be paid separately for upgrades and maintenance.

Coupon plus full price covered application

Website Tester / QA