Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oJsonToken
LOCAL oSbAuth
LOCAL oRest
LOCAL nBAutoReconnect
LOCAL oSbJsonRequest
LOCAL oSbJsonResponse
LOCAL oJson

nSuccess := 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)
oJsonToken := CreateObject("Chilkat.JsonObject")
oJsonToken:LoadFile("qa_data/tokens/paypal.json")

//  Build the Authorization request header field value.
oSbAuth := CreateObject("Chilkat.StringBuilder")
//  token_type should be "Bearer"
oSbAuth:Append(oJsonToken:StringOf("token_type"))
oSbAuth:Append(" ")
oSbAuth:Append(oJsonToken: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.
oRest := CreateObject("Chilkat.Rest")
nBAutoReconnect := 1
nSuccess := oRest:Connect("api.sandbox.paypal.com", 443, 1, nBAutoReconnect)
IF (nSuccess != 1)
    ? oRest:LastErrorText
    oJsonToken:destroy()
    oSbAuth:destroy()
    oRest:destroy()
    RETURN
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.
oRest:ClearAllHeaders()
oRest:ClearAllQueryParams()

oRest:AddHeader("Authorization", oSbAuth:GetAsString())

//  Send the POST request with an emtpy body and get the JSON response.
oSbJsonRequest := CreateObject("Chilkat.StringBuilder")
oSbJsonResponse := CreateObject("Chilkat.StringBuilder")
nSuccess := oRest:FullRequestSb("POST", "/v1/invoicing/invoices/next-invoice-number", oSbJsonRequest, oSbJsonResponse)
IF (nSuccess != 1)
    ? oRest:LastErrorText
    oJsonToken:destroy()
    oSbAuth:destroy()
    oRest:destroy()
    oSbJsonRequest:destroy()
    oSbJsonResponse:destroy()
    RETURN
ENDIF

oJson := CreateObject("Chilkat.JsonObject")
oJson:EmitCompact := 0
oJson:LoadSb(oSbJsonResponse)

? "Response Status Code = " + Str(oRest:ResponseStatusCode)

//  Did we get a 200 success response?
IF (oRest:ResponseStatusCode != 200)
    ? oJson:Emit()
    ? "Failed."
    oJsonToken:destroy()
    oSbAuth:destroy()
    oRest:destroy()
    oSbJsonRequest:destroy()
    oSbJsonResponse:destroy()
    oJson:destroy()
    RETURN
ENDIF

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

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

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

oJsonToken:destroy()
oSbAuth:destroy()
oRest:destroy()
oSbJsonRequest:destroy()
oSbJsonResponse:destroy()
oJson:destroy()