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DataFlex Web API Examples

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(DataFlex) PayPal Generate QR Code

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJsonToken
    Handle hoSbAuth
    Handle hoRest
    Boolean iBAutoReconnect
    Boolean iSuccess
    Handle hoSbPath
    Integer iNumReplacements
    Variant vSbJsonResponse
    Handle hoSbJsonResponse
    Handle hoJson
    Handle hoPngData
    String sTemp1
    Integer iTemp1

    // 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)
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonToken
    If (Not(IsComObjectCreated(hoJsonToken))) Begin
        Send CreateComObject of hoJsonToken
    End
    Get ComLoadFile Of hoJsonToken "qa_data/tokens/paypal.json" To iSuccess

    // Build the Authorization request header field value.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbAuth
    If (Not(IsComObjectCreated(hoSbAuth))) Begin
        Send CreateComObject of hoSbAuth
    End
    // token_type should be "Bearer"
    Get ComStringOf Of hoJsonToken "token_type" To sTemp1
    Get ComAppend Of hoSbAuth sTemp1 To iSuccess
    Get ComAppend Of hoSbAuth " " To iSuccess
    Get ComStringOf Of hoJsonToken "access_token" To sTemp1
    Get ComAppend Of hoSbAuth sTemp1 To iSuccess

    // 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.
    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End
    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "api.sandbox.paypal.com" 443 True iBAutoReconnect To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // ----------------------------------------------------------------------------------------------
    // 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.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbPath
    If (Not(IsComObjectCreated(hoSbPath))) Begin
        Send CreateComObject of hoSbPath
    End
    Get ComAppend Of hoSbPath "/v1/invoicing/invoices/invoice_id/qr-code" To iSuccess
    Get ComReplace Of hoSbPath "invoice_id" "INV2-ZG2H-HKAW-PMWU-N6ZR" To iNumReplacements

    Get ComGetAsString Of hoSbAuth To sTemp1
    Get ComAddHeader Of hoRest "Authorization" sTemp1 To iSuccess
    // A 500x500 image results in a PNG file of approx. 4K bytes in size.
    Get ComAddQueryParam Of hoRest "width" "500" To iSuccess
    Get ComAddQueryParam Of hoRest "height" "500" To iSuccess
    Get ComAddQueryParam Of hoRest "action" "pay" To iSuccess

    // Send the GET request and get the PNG image data as base64.
    // A successful JSON response looks like this:
    // {"image":"iVBORw0KGgoAA....AASUVORK5CYII="}
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJsonResponse
    If (Not(IsComObjectCreated(hoSbJsonResponse))) Begin
        Send CreateComObject of hoSbJsonResponse
    End
    Get ComGetAsString Of hoSbPath To sTemp1
    Get pvComObject of hoSbJsonResponse to vSbJsonResponse
    Get ComFullRequestNoBodySb Of hoRest "GET" sTemp1 vSbJsonResponse To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Set ComEmitCompact Of hoJson To False
    Get pvComObject of hoSbJsonResponse to vSbJsonResponse
    Get ComLoadSb Of hoJson vSbJsonResponse To iSuccess

    Get ComResponseStatusCode Of hoRest To iTemp1
    Showln "Response Status Code = " iTemp1

    // Did we get a 200 success response?
    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComEmit Of hoJson To sTemp1
        Showln sTemp1
        Showln "Failed."
        Procedure_Return
    End

    // If the 200 response is received, the response body contains the PNG data.
    // Save the PNG to a file.
    Get Create (RefClass(cComChilkatBinData)) To hoPngData
    If (Not(IsComObjectCreated(hoPngData))) Begin
        Send CreateComObject of hoPngData
    End
    Get ComStringOf Of hoJson "image" To sTemp1
    Get ComAppendEncoded Of hoPngData sTemp1 "base64" To iSuccess
    Get ComWriteFile Of hoPngData "qa_output/paypal_qr_code.png" To iSuccess
    If (iSuccess = False) Begin
        Showln "Failed to save PNG file."
        Procedure_Return
    End

    Showln "Success."


End_Procedure

 

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