React site enhancement

We have a site that is currently in ReactJs, the user is able to login and then go to their profile screen. When on this screen they are able to click a deposit option and a withdraw option. We need a developer to integrate the Braintree sdk and then when the user submits their request send the request to a php script that we have on the server. Once the user deposits or withdraws we have to update the firestore in order to update the UI. Specifics and access to the code will be given to the developer chosen.