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C Web API Examples

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(C) PayPal - Generate Invoice Number

Generates the next invoice number that is available to the user.

Note: This example requires Chilkat v9.5.0.65 or greater.

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

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    HCkStringBuilder sbAuth;
    HCkRest rest;
    BOOL bAutoReconnect;
    BOOL success;
    HCkStringBuilder sbJsonRequest;
    HCkStringBuilder sbJsonResponse;
    HCkJsonObject json;

    // Note: Requires Chilkat v9.5.0.65 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..
    // ----------------------------------------------------------------------------------------------

    // Clear the REST object of any headers or query params from previous requests.
    CkRest_ClearAllHeaders(rest);
    CkRest_ClearAllQueryParams(rest);

    CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbAuth));

    // Send the POST request with an emtpy body and get the JSON response.
    sbJsonRequest = CkStringBuilder_Create();
    sbJsonResponse = CkStringBuilder_Create();
    success = CkRest_FullRequestSb(rest,"POST","/v1/invoicing/invoices/next-invoice-number",sbJsonRequest,sbJsonResponse);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbJsonRequest);
        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(sbJsonRequest);
        CkStringBuilder_Dispose(sbJsonResponse);
        CkJsonObject_Dispose(json);
        return;
    }

    // Sample JSON response is shown below.
    printf("%s\n",CkJsonObject_emit(json));
    printf("----------------------\n");
    printf("Next invoice number: %s\n",CkJsonObject_stringOf(json,"number"));
    printf("success\n");

    // ------------------------------------------------
    // A sample JSON response:

    // 	{ 
    // 	  "number": "0003"
    // 	}


    CkJsonObject_Dispose(jsonToken);
    CkStringBuilder_Dispose(sbAuth);
    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbJsonRequest);
    CkStringBuilder_Dispose(sbJsonResponse);
    CkJsonObject_Dispose(json);

    }

 

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