Investigate rewrite iOS part using Swift about react-native-braintree HOT 5 CLOSED

//  RNBrainTree.swift

import Foundation

@objc(RNBraintree)
class RNBraintree: NSObject {
    public var apiClient: BTAPIClient!
    public var dataCollector: BTDataCollector!
    
    @objc
    func showPayPalModule(
        _ options: NSDictionary,
        resolver resolve: @escaping RCTPromiseResolveBlock,
        rejecter reject: @escaping RCTPromiseRejectBlock
    ) {
        let clientToken = options["clientToken"] as? String ?? ""
        let amount = options["amount"] as? String ?? ""
        let currencyCode = options["currencyCode"] as? String ?? ""
        
        self.apiClient = BTAPIClient(authorization: clientToken)
        self.dataCollector = BTDataCollector(apiClient: self.apiClient)
        
        let payPalDriver = BTPayPalDriver(apiClient: self.apiClient)
        let request = BTPayPalCheckoutRequest(amount: amount)
        request.currencyCode = currencyCode

        payPalDriver.tokenizePayPalAccount(with: request) { tokenizedPayPalAccount, error in
            if let error = error {
                reject("ONE_TIME_PAYMENT_FAILED", error.localizedDescription, nil)
                return
            }
            if tokenizedPayPalAccount == nil {
                reject("ONE_TIME_PAYMENT_CANCELLED", "Payment has been cancelled", nil)
                return
            }
            
            self.dataCollector.collectDeviceData { deviceData in
                resolve(["deviceData": deviceData,
                        "email": tokenizedPayPalAccount?.email ?? "",
                        "nonce": tokenizedPayPalAccount?.nonce ?? ""])
            }
        }
    }
}