LoginInteractor.swift

class LoginInteractor {
    
    func getPaymentToken(parameters: ModuleParameters?,
                         completion: @escaping (String?, HTTPURLResponse?, Error?) -> Void) {
        
        let service = MockLoginNetworkService()
        guard let parameters = parameters,
                let username = parameters[LoginModuleParameters.username.rawValue],
                let password = parameters[LoginModuleParameters.password.rawValue] else {
                return
        }
        let getTokenParameters = [LoginModuleParameters.username.rawValue: username,
                                  LoginModuleParameters.password.rawValue: password]
        service.post(host: "login",
                     path: "/payment-token",
                     parameters: getTokenParameters) { (response, urlResponse, error) in
            
            // We are not going to check errors and URL response status codes, just a shortest path.
            var networkError: ResponseError? = nil
            if let error = error {
                networkError = ResponseError(error: error, response: urlResponse)
            }
            let token = response?["paymentToken"] as? String
            
            completion(token, urlResponse, networkError)
        }
    }
}