Alamofire with -u

Question

I need to make this request in Alamofire.

curl https://api.omise.co/charges \
  -u $OMISE_SECRET_KEY: \
  -d "amount=100000" \
  -d "currency=thb" \
  -d "card=tokn_test_5g5mep9yrko3vx2f0hx"

I guess it should be something like

let url = "https://api.omise.co/charges"
let parameters: [String: Any] = ["amount": 100000,
                                  "currency": "thb",
                                  "card": token]
AF.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default).response { response in
    switch response.result {
        case .success( _):
            let data = responseJSON.result.value!
            print(data)
        case .failure(let error):
            print(error.localizedDescription)

     }
}

How do I make a request?

I don't know how to handle -u $ OMISE_SECRET_KEY:.