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

Chilkat.Http http = new Chilkat.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"
//   }
// }

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateInt("amount",45671);
json.UpdateString("externalId","234567898654");
json.UpdateString("description","Test transaction");
json.UpdateString("buyer.email","jan.kowalski@melements.pl");

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

// Calculate the Signature header.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
crypt.MacAlgorithm = "hmac";
crypt.EncodingMode = "base64";
crypt.SetMacKeyString(mySigCalcKey);
crypt.HashAlgorithm = "SHA-256";
string messageBody = json.Emit();
string signature = crypt.MacStringENC(messageBody);

http.SetRequestHeader("Idempotency-Key",crypt.GenerateUuid());
http.SetRequestHeader("Api-Key",myApiAccessKey);
http.SetRequestHeader("Signature",signature);
http.SetRequestHeader("Content-Type","application/json");
http.Accept = "application/json";

Chilkat.HttpResponse resp = http.PostJson3("https://api.sandbox.paynow.pl/v1/payments","application/json",json);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("Response body:");
Debug.WriteLine(resp.BodyStr);

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

Chilkat.JsonObject jsonResp = new Chilkat.JsonObject();
jsonResp.Load(resp.BodyStr);
string redirectUrl = json.StringOf("redirectUrl");
string paymentId = json.StringOf("paymentId");
string status = json.StringOf("status");