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C Web API Examples

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(C) 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 C/C++ Library Downloads

MS Visual C/C++

Linux/CentOS C/C++

Alpine Linux C/C++

MAC OS X C/C++

armhf/aarch64 C/C++

C++ Builder

iOS C/C++

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Win Mobile 5.0/Pocket PC 2003

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MinGW C/C++

#include <C_CkJsonObject.h>
#include <C_CkStringBuilder.h>
#include <C_CkRest.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    HCkStringBuilder sbAuth;
    HCkRest rest;
    BOOL bAutoReconnect;
    BOOL success;
    HCkStringBuilder sbPath;
    int numReplacements;
    HCkStringBuilder sbJsonResponse;
    HCkJsonObject json;
    HCkBinData pngData;

    // 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 = CkJsonObject_Create();
    CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/paypal.json");

    // Build the Authorization request header field value.
    sbAuth = CkStringBuilder_Create();
    // token_type should be "Bearer"
    CkStringBuilder_Append(sbAuth,CkJsonObject_stringOf(jsonToken,"token_type"));
    CkStringBuilder_Append(sbAuth," ");
    CkStringBuilder_Append(sbAuth,CkJsonObject_stringOf(jsonToken,"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 = CkRest_Create();
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"api.sandbox.paypal.com",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        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 = CkStringBuilder_Create();
    CkStringBuilder_Append(sbPath,"/v1/invoicing/invoices/invoice_id/qr-code");
    numReplacements = CkStringBuilder_Replace(sbPath,"invoice_id","INV2-ZG2H-HKAW-PMWU-N6ZR");

    CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbAuth));
    // A 500x500 image results in a PNG file of approx. 4K bytes in size.
    CkRest_AddQueryParam(rest,"width","500");
    CkRest_AddQueryParam(rest,"height","500");
    CkRest_AddQueryParam(rest,"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 = CkStringBuilder_Create();
    success = CkRest_FullRequestNoBodySb(rest,"GET",CkStringBuilder_getAsString(sbPath),sbJsonResponse);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbPath);
        CkStringBuilder_Dispose(sbJsonResponse);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_LoadSb(json,sbJsonResponse);

    printf("Response Status Code = %d\n",CkRest_getResponseStatusCode(rest));

    // Did we get a 200 success response?
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("%s\n",CkJsonObject_emit(json));
        printf("Failed.\n");
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbPath);
        CkStringBuilder_Dispose(sbJsonResponse);
        CkJsonObject_Dispose(json);
        return;
    }

    // If the 200 response is received, the response body contains the PNG data.
    // Save the PNG to a file.
    pngData = CkBinData_Create();
    CkBinData_AppendEncoded(pngData,CkJsonObject_stringOf(json,"image"),"base64");
    success = CkBinData_WriteFile(pngData,"qa_output/paypal_qr_code.png");
    if (success == FALSE) {
        printf("Failed to save PNG file.\n");
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbPath);
        CkStringBuilder_Dispose(sbJsonResponse);
        CkJsonObject_Dispose(json);
        CkBinData_Dispose(pngData);
        return;
    }

    printf("Success.\n");


    CkJsonObject_Dispose(jsonToken);
    CkStringBuilder_Dispose(sbAuth);
    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbPath);
    CkStringBuilder_Dispose(sbJsonResponse);
    CkJsonObject_Dispose(json);
    CkBinData_Dispose(pngData);

    }

 

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