(Visual FoxPro) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loJsonToken
LOCAL loSbAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL lnSuccess
LOCAL loSbJsonRequest
LOCAL loSbJsonResponse
LOCAL loJson

* 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)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
loJsonToken.LoadFile("qa_data/tokens/paypal.json")

* Build the Authorization request header field value.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbAuth = CreateObject('Chilkat.StringBuilder')
* token_type should be "Bearer"
loSbAuth.Append(loJsonToken.StringOf("token_type"))
loSbAuth.Append(" ")
loSbAuth.Append(loJsonToken.StringOf("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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("api.sandbox.paypal.com",443,1,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    CANCEL
ENDIF

* ----------------------------------------------------------------------------------------------
* 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.
loRest.ClearAllHeaders()
loRest.ClearAllQueryParams()

loRest.AddHeader("Authorization",loSbAuth.GetAsString())

* Send the POST request with an emtpy body and get the JSON response.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJsonRequest = CreateObject('Chilkat.StringBuilder')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJsonResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestSb("POST","/v1/invoicing/invoices/next-invoice-number",loSbJsonRequest,loSbJsonResponse)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbJsonRequest
    RELEASE loSbJsonResponse
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0
loJson.LoadSb(loSbJsonResponse)

? "Response Status Code = " + STR(loRest.ResponseStatusCode)

* Did we get a 200 success response?
IF (loRest.ResponseStatusCode <> 200) THEN
    ? loJson.Emit()
    ? "Failed."
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbJsonRequest
    RELEASE loSbJsonResponse
    RELEASE loJson
    CANCEL
ENDIF

* Sample JSON response is shown below.
? loJson.Emit()
? "----------------------"
? "Next invoice number: " + loJson.StringOf("number")
? "success"

* ------------------------------------------------
* A sample JSON response:

* 	{ 
* 	  "number": "0003"
* 	}

RELEASE loJsonToken
RELEASE loSbAuth
RELEASE loRest
RELEASE loSbJsonRequest
RELEASE loSbJsonResponse
RELEASE loJson