Xojo Plugin

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

Xojo Plugin

Dim success As Boolean
success = False

// 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)
Dim jsonToken As New Chilkat.JsonObject
success = jsonToken.LoadFile("qa_data/tokens/paypal.json")

// Build the Authorization request header field value.
Dim sbAuth As New Chilkat.StringBuilder
// token_type should be "Bearer"
success = sbAuth.Append(jsonToken.StringOf("token_type"))
success = sbAuth.Append(" ")
success = sbAuth.Append(jsonToken.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.
Dim rest As New Chilkat.Rest
Dim bAutoReconnect As Boolean
bAutoReconnect = True
success = rest.Connect("api.sandbox.paypal.com",443,True,bAutoReconnect)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// ----------------------------------------------------------------------------------------------
// 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.
Dim sbPath As New Chilkat.StringBuilder
success = sbPath.Append("/v1/invoicing/invoices/invoice_id/qr-code")
Dim numReplacements As Int32
numReplacements = sbPath.Replace("invoice_id","INV2-ZG2H-HKAW-PMWU-N6ZR")

success = rest.AddHeader("Authorization",sbAuth.GetAsString())
// A 500x500 image results in a PNG file of approx. 4K bytes in size.
success = rest.AddQueryParam("width","500")
success = rest.AddQueryParam("height","500")
success = rest.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="}
Dim sbJsonResponse As New Chilkat.StringBuilder
success = rest.FullRequestNoBodySb("GET",sbPath.GetAsString(),sbJsonResponse)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

Dim json As New Chilkat.JsonObject
json.EmitCompact = False
success = json.LoadSb(sbJsonResponse)

System.DebugLog("Response Status Code = " + Str(rest.ResponseStatusCode))

// Did we get a 200 success response?
If (rest.ResponseStatusCode <> 200) Then
    System.DebugLog(json.Emit())
    System.DebugLog("Failed.")
    Return
End If

// If the 200 response is received, the response body contains the PNG data.
// Save the PNG to a file.
Dim pngData As New Chilkat.BinData
success = pngData.AppendEncoded(json.StringOf("image"),"base64")
success = pngData.WriteFile("qa_output/paypal_qr_code.png")
If (success = False) Then
    System.DebugLog("Failed to save PNG file.")
    Return
End If

System.DebugLog("Success.")