Facebook App - Ecommerce - iOS - Swift - InitiatedCheckout

func logInitiatedCheckoutEvent(
    contentId: String
    contentType: String
    numItems: Int
    currency: String
    paymentInfoAvailable: BOOL
    valToSum: (double)price
) {
    let parameters = [
        AppEvents.ParameterName("FBSDKAppEventParameterNameContentID").rawValue: contentId,
        AppEvents.ParameterName("FBSDKAppEventParameterNameContentType").rawValue: contentType,
        AppEvents.ParameterName("FBSDKAppEventParameterNameNumItems").rawValue: numItems,
        AppEvents.ParameterName("FBSDKAppEventParameterNamePaymentInfoAvailable").rawValue: paymentInfoAvailable,
        AppEvents.ParameterName("FBSDKAppEventParameterNameCurrency").rawValue: currency
    ]

    AppEvents.logEvent(.init("FBSDKAppEventNameInitiatedCheckout"), parameters: parameters)
}