(Swift 3,4,5...) HTTP POST with JSON Body

Demonstrates sending an HTTP POST with a JSON body.

For more information, see https://chilkatsoft.com/http_post_with_json_body.asp

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!
    var success: Bool

    // Implements the following CURL command:

    // curl -v -X POST https://example.com/v2/checkout/orders \
    // -H "Content-Type: application/json" \
    // -H "Authorization: Bearer Access-Token" \
    // -H "Request-Id: 7b92603e-77ed-4896-8e78-5dea2050476a" \
    // -d '{ 
    //       "reference_id": "REFID-000-1001",
    //       "amount": {
    //         "currency_code": "CAD",
    //         "value": "10.00"
    //       }
    //     }'

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // Use this online tool to generate code from sample JSON:
    // Generate Code to Create JSON

    // The following JSON is sent in the request body.

    // {
    //   "reference_id": "REFID-000-1001",
    //   "amount": {
    //     "currency_code": "CAD",
    //     "value": "10.00"
    //   }
    // }

    let json = CkoJsonObject()!
    json.update("reference_id", value: "REFID-000-1001")
    json.update("amount.currency_code", value: "CAD")
    json.update("amount.value", value: "10.00")

    // Adds the "Authorization: Bearer Access-Token" header.
    http.authToken = "Access-Token"
    http.setRequestHeader("Request-Id", value: "7b92603e-77ed-4896-8e78-5dea2050476a")
    http.setRequestHeader("Content-Type", value: "application/json")

    var resp: CkoHttpResponse? = http.postJson3("https://example.com/v2/checkout/orders", contentType: "application/json", json: json)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    print("\(resp!.statusCode.intValue)")
    print("\(resp!.bodyStr!)")
    resp = nil

}