iOS Swift Native URLSession Client

import Foundation

struct BaziRequest: Encodable {
    let birthDate: String
    let birthTime: String
    let gender: String
}

class BaziClient {
    let apiKey: String
    init(apiKey: String) { self.apiKey = apiKey }

    func calculate(birthDate: String, birthTime: String, gender: String) async throws -> [String: Any] {
        var req = URLRequest(url: URL(string: "https://api.baziapi.pro/api/v1/bazi/calculate")!)
        req.httpMethod = "POST"
        req.setValue(apiKey, forHTTPHeaderField: "x-api-key")
        req.setValue("application/json", forHTTPHeaderField: "Content-Type")
        req.httpBody = try JSONEncoder().encode(BaziRequest(birthDate: birthDate, birthTime: birthTime, gender: gender))

        let (data, _) = try await URLSession.shared.data(for: req)
        return try JSONSerialization.jsonObject(with: data) as! [String: Any]
    }
}