Visual FoxPro

PayPal - Generate Invoice Number

See more PayPal Examples

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

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

Visual FoxPro

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

lnSuccess = 0

*  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)
loJsonToken = CreateObject('Chilkat.JsonObject')
loJsonToken.LoadFile("qa_data/tokens/paypal.json")

*  Build the Authorization request header field value.
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.
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.
loSbJsonRequest = CreateObject('Chilkat.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

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