(Swift 3,4,5...) PayPal - Generate Invoice Number

Generates the next invoice number that is available to the user.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // Note: Requires Chilkat v9.5.0.65 or greater.

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Load our previously obtained access token. (see PayPal OAuth2 Access Token)
    let jsonToken = CkoJsonObject()!
    jsonToken.loadFile("qa_data/tokens/paypal.json")

    // Build the Authorization request header field value.
    let sbAuth = CkoStringBuilder()!
    // token_type should be "Bearer"
    sbAuth.append(jsonToken.string(of: "token_type"))
    sbAuth.append(" ")
    sbAuth.append(jsonToken.string(of: "access_token"))

    // Make the initial connection.
    // A single REST object, once connected, can be used for many PayPal REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    let rest = CkoRest()!
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect("api.sandbox.paypal.com", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // ----------------------------------------------------------------------------------------------
    // The code above this comment could be placed inside a function/subroutine within the application
    // because the connection does not need to be made for every request.  Once the connection is made
    // the app may send many requests..
    // ----------------------------------------------------------------------------------------------

    // Clear the REST object of any headers or query params from previous requests.
    rest.clearAllHeaders()
    rest.clearAllQueryParams()

    rest.addHeader("Authorization", value: sbAuth.getAsString())

    // Send the POST request with an emtpy body and get the JSON response.
    let sbJsonRequest = CkoStringBuilder()!
    let sbJsonResponse = CkoStringBuilder()!
    success = rest.fullRequestSb("POST", uriPath: "/v1/invoicing/invoices/next-invoice-number", requestBody: sbJsonRequest, responseBody: sbJsonResponse)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    let json = CkoJsonObject()!
    json.emitCompact = false
    json.loadSb(sbJsonResponse)

    print("Response Status Code = \(rest.responseStatusCode.intValue)")

    // Did we get a 200 success response?
    if rest.responseStatusCode.intValue != 200 {
        print("\(json.emit()!)")
        print("Failed.")
        return
    }

    // Sample JSON response is shown below.
    print("\(json.emit()!)")
    print("----------------------")
    print("Next invoice number: \(json.string(of: "number")!)")
    print("success")

    // ------------------------------------------------
    // A sample JSON response:

    // 	{ 
    // 	  "number": "0003"
    // 	}

}