Visual FoxPro

PayPal Generate QR Code

See more PayPal Examples

Generates a QR code for an invoice, by ID.

The QR code is a PNG image in Base64-encoded format that corresponds to the invoice ID.

Note: A QR code can only be generated for an invoice that has been both created and sent.

See also Generate QR Code

Visual FoxPro

LOCAL lnSuccess
LOCAL loJsonToken
LOCAL loSbAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL loSbPath
LOCAL lnNumReplacements
LOCAL loSbJsonResponse
LOCAL loJson
LOCAL loPngData

lnSuccess = 0

* Note: Requires Chilkat v9.5.0.64 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..
* ----------------------------------------------------------------------------------------------

* Build a path using an invoice ID.
loSbPath = CreateObject('Chilkat.StringBuilder')
loSbPath.Append("/v1/invoicing/invoices/invoice_id/qr-code")
lnNumReplacements = loSbPath.Replace("invoice_id","INV2-ZG2H-HKAW-PMWU-N6ZR")

loRest.AddHeader("Authorization",loSbAuth.GetAsString())
* A 500x500 image results in a PNG file of approx. 4K bytes in size.
loRest.AddQueryParam("width","500")
loRest.AddQueryParam("height","500")
loRest.AddQueryParam("action","pay")

* Send the GET request and get the PNG image data as base64.
* A successful JSON response looks like this:
* {"image":"iVBORw0KGgoAA....AASUVORK5CYII="}
loSbJsonResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestNoBodySb("GET",loSbPath.GetAsString(),loSbJsonResponse)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbPath
    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 loSbPath
    RELEASE loSbJsonResponse
    RELEASE loJson
    CANCEL
ENDIF

* If the 200 response is received, the response body contains the PNG data.
* Save the PNG to a file.
loPngData = CreateObject('Chilkat.BinData')
loPngData.AppendEncoded(loJson.StringOf("image"),"base64")
lnSuccess = loPngData.WriteFile("qa_output/paypal_qr_code.png")
IF (lnSuccess = 0) THEN
    ? "Failed to save PNG file."
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbPath
    RELEASE loSbJsonResponse
    RELEASE loJson
    RELEASE loPngData
    CANCEL
ENDIF

? "Success."

RELEASE loJsonToken
RELEASE loSbAuth
RELEASE loRest
RELEASE loSbPath
RELEASE loSbJsonResponse
RELEASE loJson
RELEASE loPngData