Go

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

Go

    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)
    jsonToken := chilkat.NewJsonObject()
    jsonToken.LoadFile("qa_data/tokens/paypal.json")

    // Build the Authorization request header field value.
    sbAuth := chilkat.NewStringBuilder()
    // token_type should be "Bearer"
    sbAuth.Append(*jsonToken.StringOf("token_type"))
    sbAuth.Append(" ")
    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.
    rest := chilkat.NewRest()
    bAutoReconnect := true
    success = rest.Connect("api.sandbox.paypal.com",443,true,bAutoReconnect)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        return
    }

    // ----------------------------------------------------------------------------------------------
    // 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.
    sbPath := chilkat.NewStringBuilder()
    sbPath.Append("/v1/invoicing/invoices/invoice_id/qr-code")
    numReplacements := sbPath.Replace("invoice_id","INV2-ZG2H-HKAW-PMWU-N6ZR")

    rest.AddHeader("Authorization",*sbAuth.GetAsString())
    // A 500x500 image results in a PNG file of approx. 4K bytes in size.
    rest.AddQueryParam("width","500")
    rest.AddQueryParam("height","500")
    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="}
    sbJsonResponse := chilkat.NewStringBuilder()
    success = rest.FullRequestNoBodySb("GET",*sbPath.GetAsString(),sbJsonResponse)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        sbJsonResponse.DisposeStringBuilder()
        return
    }

    json := chilkat.NewJsonObject()
    json.SetEmitCompact(false)
    json.LoadSb(sbJsonResponse)

    fmt.Println("Response Status Code = ", rest.ResponseStatusCode())

    // Did we get a 200 success response?
    if rest.ResponseStatusCode() != 200 {
        fmt.Println(*json.Emit())
        fmt.Println("Failed.")
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        sbJsonResponse.DisposeStringBuilder()
        json.DisposeJsonObject()
        return
    }

    // If the 200 response is received, the response body contains the PNG data.
    // Save the PNG to a file.
    pngData := chilkat.NewBinData()
    pngData.AppendEncoded(*json.StringOf("image"),"base64")
    success = pngData.WriteFile("qa_output/paypal_qr_code.png")
    if success == false {
        fmt.Println("Failed to save PNG file.")
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        sbJsonResponse.DisposeStringBuilder()
        json.DisposeJsonObject()
        pngData.DisposeBinData()
        return
    }

    fmt.Println("Success.")

    jsonToken.DisposeJsonObject()
    sbAuth.DisposeStringBuilder()
    rest.DisposeRest()
    sbPath.DisposeStringBuilder()
    sbJsonResponse.DisposeStringBuilder()
    json.DisposeJsonObject()
    pngData.DisposeBinData()