(Unicode C++) Paynow.pl -- Make a Payment Request

Make a payment request POST with prepared message on Paynow payment request endpoint.

For more information, see https://docs.paynow.pl/#section/Payments/Make-a-payment

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#include <CkHttpW.h>
#include <CkJsonObjectW.h>
#include <CkCrypt2W.h>
#include <CkHttpResponseW.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttpW http;
    bool success;

    // Implements the following CURL command:

    // curl --request POST 'https://api.sandbox.paynow.pl/v1/payments' \
    // -H 'Content-Type: application/json' \
    // -H 'Api-Key: c12c386b-650b-43db-9430-d84fc05d9433' \
    // -H 'Signature: aYPCytCoc+/wFgqHZJjgBCi20omXTn0yzm9LysJgnFo=' \
    // -H 'Idempotency-Key: 59c6dd26-f905-487b-96c9-fd1d2bd76885' \
    // --data-raw '{
    //     "amount": 45671,
    //     "externalId": "234567898654",
    //     "description": "Test transaction",
    //     "buyer": {
    //         "email": "jan.kowalski@melements.pl"
    //     }
    // }'

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // Use this online tool to generate code from sample JSON:
    // Generate Code to Create JSON

    // The following JSON is sent in the request body.

    // {
    //   "amount": 45671,
    //   "externalId": "234567898654",
    //   "description": "Test transaction",
    //   "buyer": {
    //     "email": "jan.kowalski@melements.pl"
    //   }
    // }

    CkJsonObjectW json;
    json.UpdateInt(L"amount",45671);
    json.UpdateString(L"externalId",L"234567898654");
    json.UpdateString(L"description",L"Test transaction");
    json.UpdateString(L"buyer.email",L"jan.kowalski@melements.pl");

    const wchar_t *myApiAccessKey = L"c12c386b-650b-43db-9430-d84fc05d9433";
    const wchar_t *mySigCalcKey = L"b758f20d-ba92-44fa-acca-f57e99787b9d";

    // Calculate the Signature header.
    CkCrypt2W crypt;
    crypt.put_MacAlgorithm(L"hmac");
    crypt.put_EncodingMode(L"base64");
    crypt.SetMacKeyString(mySigCalcKey);
    crypt.put_HashAlgorithm(L"SHA-256");
    const wchar_t *messageBody = json.emit();
    const wchar_t *signature = crypt.macStringENC(messageBody);

    http.SetRequestHeader(L"Idempotency-Key",crypt.generateUuid());
    http.SetRequestHeader(L"Api-Key",myApiAccessKey);
    http.SetRequestHeader(L"Signature",signature);
    http.SetRequestHeader(L"Content-Type",L"application/json");
    http.put_Accept(L"application/json");

    CkHttpResponseW *resp = http.PostJson3(L"https://api.sandbox.paynow.pl/v1/payments",L"application/json",json);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    wprintf(L"Response body:\n");
    wprintf(L"%s\n",resp->bodyStr());

    // Sample response:
    // {
    //   "redirectUrl": "https://paywall.sandbox.paynow.pl/NOA0-YJ9-Y1P-29V?token=eyJraWQiOiJhMD ... L60wk",
    //   "paymentId": "NOA0-YJ9-Y1P-29V",
    //   "status": "NEW"
    // }

    CkJsonObjectW jsonResp;
    jsonResp.Load(resp->bodyStr());
    const wchar_t *redirectUrl = json.stringOf(L"redirectUrl");
    const wchar_t *paymentId = json.stringOf(L"paymentId");
    const wchar_t *status = json.stringOf(L"status");
    }