next.js feature

i need a next.js developer who can add a referral feature to my next.js app. it is not a new app, you're not building any app, it's an existing app that is working really well. all i need you to do is to add a multi-tier reward feature to the app and that's it. the work requires a very good knowledge of stripe connect API and stripe payment API in general. my budget is $70 and the deadline is 5 days including the weekends.

below is the requirements doc:
https://docs.google.com/document/d/1OBE7iWai7fARz0wVaiad5T-FgpNU746NUunllBB3XLQ/edit?usp=sharing