Hi, yelp api doesn't use Oauth for authentication anymore. How should I authenticate my app ?

request.addValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")

import Foundation

protocol Endpoint {
    var base: String { get }
    var path: String { get }
    var queryItems: [URLQueryItem] { get }
}

extension Endpoint {
    var urlComponents: URLComponents {
        var components = URLComponents(string: base)!
        components.path = path
        components.queryItems = queryItems
        return components
    }

    // Note here that instead of a computed property that returns a request, we're
    // defining a function in the protocol extension that takes the apiKey and adds it to the
    // header
    func request(withApiKey key: String) -> URLRequest {
        let url = urlComponents.url!
        var request = URLRequest(url: url)
        request.addValue("Bearer \(key)", forHTTPHeaderField: "Authorization")

        return request
    }
}


enum Yelp {
    case business(id: String)
}

extension Yelp: Endpoint {
    var base: String {
        return "https://api.yelp.com"
    }

    var path: String {
        switch self {
        case .business(let id): return "/v3/businesses/\(id)"
        }
    }

    var queryItems: [URLQueryItem] {
        switch self {
        case .business: return []
        }
    }
}

class YelpAPIClient {
    var apiKey: String {
        // ideally fetched from keychain or somewhere secure
        return "sample_key"
    }

    let session: URLSession

    init(session: URLSession) {
        self.session = session
    }

    func searchBusinesses() {
        let endpoint = Yelp.business(id: "abcdefg")
        // Inside the client, when we retrieve the request object from the endpoint, we're
        // passing in the apiKey
        let request = endpoint.request(withApiKey: apiKey)

        // Do the usual stuff!
    }
}