(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 <C_CkHttp.h>
#include <C_CkJsonObject.h>
#include <C_CkCrypt2.h>
#include <C_CkHttpResponse.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    BOOL success;
    HCkJsonObject json;
    const char *myApiAccessKey;
    const char *mySigCalcKey;
    HCkCrypt2 crypt;
    const char *messageBody;
    const char *signature;
    HCkHttpResponse resp;
    HCkJsonObject jsonResp;
    const char *redirectUrl;
    const char *paymentId;
    const char *status;

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

    http = CkHttp_Create();

    // 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"
    //   }
    // }

    json = CkJsonObject_Create();
    CkJsonObject_UpdateInt(json,"amount",45671);
    CkJsonObject_UpdateString(json,"externalId","234567898654");
    CkJsonObject_UpdateString(json,"description","Test transaction");
    CkJsonObject_UpdateString(json,"buyer.email","jan.kowalski@melements.pl");

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

    // Calculate the Signature header.
    crypt = CkCrypt2_Create();
    CkCrypt2_putMacAlgorithm(crypt,"hmac");
    CkCrypt2_putEncodingMode(crypt,"base64");
    CkCrypt2_SetMacKeyString(crypt,mySigCalcKey);
    CkCrypt2_putHashAlgorithm(crypt,"SHA-256");
    messageBody = CkJsonObject_emit(json);
    signature = CkCrypt2_macStringENC(crypt,messageBody);

    CkHttp_SetRequestHeader(http,"Idempotency-Key",CkCrypt2_generateUuid(crypt));
    CkHttp_SetRequestHeader(http,"Api-Key",myApiAccessKey);
    CkHttp_SetRequestHeader(http,"Signature",signature);
    CkHttp_SetRequestHeader(http,"Content-Type","application/json");
    CkHttp_putAccept(http,"application/json");

    resp = CkHttp_PostJson3(http,"https://api.sandbox.paynow.pl/v1/payments","application/json",json);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(json);
        CkCrypt2_Dispose(crypt);
        return;
    }

    printf("Response body:\n");
    printf("%s\n",CkHttpResponse_bodyStr(resp));

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

    jsonResp = CkJsonObject_Create();
    CkJsonObject_Load(jsonResp,CkHttpResponse_bodyStr(resp));
    redirectUrl = CkJsonObject_stringOf(json,"redirectUrl");
    paymentId = CkJsonObject_stringOf(json,"paymentId");
    status = CkJsonObject_stringOf(json,"status");


    CkHttp_Dispose(http);
    CkJsonObject_Dispose(json);
    CkCrypt2_Dispose(crypt);
    CkJsonObject_Dispose(jsonResp);

    }