Customizing purchasing process in Wix Stores

is it possible to customize purchasing process using Wix stores? I need an option where customer has to sign a contract, probably via DocuSign or similar tool after adding items in the cart and before making a payment.

You are able to customize your cart page, take a look onto examples…

  1. Add To Cart Custom Donut Selection With Quantity - #3 by jordon

  2. How to create a custom cart reminder message

  3. Custom cart throws error for first time visitors - #3 by avinashmurthy

  4. Custom cart popup

  5. Customize Shopping cart checkout using wix stores API to store order details - #2 by erramanece

  6. Custom Shopping Carts

  7. Custom Shopping Cart - Payments

  8. …and so on…

You will find a lot of informations, reading posts about SHOPPING-CART.