(C++) PayPal - Create a PayPal Payment

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Creates a payment to be paid from a PayPal account (as opposed to being funded by a credit card).

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

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#include <CkJsonObject.h>
#include <CkStringBuilder.h>
#include <CkRest.h>

void ChilkatSample(void)
    {
    // 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)
    CkJsonObject jsonToken;
    jsonToken.LoadFile("qa_data/tokens/paypal.json");

    // Build the Authorization request header field value.
    CkStringBuilder sbAuth;
    // token_type should be "Bearer"
    sbAuth.Append(jsonToken.stringOf("token_type"));
    sbAuth.Append(" ");
    sbAuth.Append(jsonToken.stringOf("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.
    CkRest rest;
    bool bAutoReconnect = true;
    bool success = rest.Connect("api.sandbox.paypal.com",443,true,bAutoReconnect);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        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 the JSON containing the transaction information.
    CkJsonObject json;
    json.put_EmitCompact(false);
    json.UpdateString("intent","sale");
    json.UpdateString("redirect_urls.return_url","http://www.example.com/return_url");
    json.UpdateString("redirect_urls.cancel_url","http://www.example.com/cancel_url");
    json.UpdateString("payer.payment_method","paypal");
    json.UpdateString("transactions[0].amount.total","7.47");
    json.UpdateString("transactions[0].amount.currency","USD");
    json.UpdateString("transactions[0].description","This is the payment transaction description.");

    std::cout << json.emit() << "\r\n";

    // The JSON created by the above code is this:

    // 	{ 
    // 	  "intent": "sale",
    // 	  "redirect_urls": { 
    // 	    "return_url": "http://www.example.com/return_url",
    // 	    "cancel_url": "http://www.example.com/cancel_url"
    // 	  },
    // 	  "payer": { 
    // 	    "payment_method": "paypal"
    // 	  },
    // 	  "transactions": [
    // 	    { 
    // 	      "amount": { 
    // 	        "total": "7.47",
    // 	        "currency": "USD"
    // 	      },
    // 	      "description": "This is the payment transaction description."
    // 	    }
    // 	  ]
    // 	}

    rest.AddHeader("Authorization",sbAuth.getAsString());
    rest.AddHeader("Content-Type","application/json");

    // Send the POST request containign the JSON in the request body, and get the JSON response.
    CkStringBuilder sbJsonRequest;
    json.put_EmitCompact(true);
    json.EmitSb(sbJsonRequest);
    CkStringBuilder sbJsonResponse;
    success = rest.FullRequestSb("POST","/v1/payments/payment",sbJsonRequest,sbJsonResponse);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    json.put_EmitCompact(false);
    json.LoadSb(sbJsonResponse);

    std::cout << "Response Status Code = " << rest.get_ResponseStatusCode() << "\r\n";

    // Did we get a 201 success response?
    if (rest.get_ResponseStatusCode() != 201) {
        std::cout << json.emit() << "\r\n";
        std::cout << "Failed." << "\r\n";
        return;
    }

    // Sample JSON response is shown below.
    std::cout << json.emit() << "\r\n";
    std::cout << "success" << "\r\n";

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

    // 	{ 
    // 	  "id": "PAY-1XK50350XV338620BLA3CZGI",
    // 	  "intent": "sale",
    // 	  "state": "created",
    // 	  "payer": { 
    // 	    "payment_method": "paypal",
    // 	    "use_vendor_currency_conversion": false
    // 	  },
    // 	  "transactions": [
    // 	    { 
    // 	      "amount": { 
    // 	        "total": "7.47",
    // 	        "currency": "USD"
    // 	      },
    // 	      "description": "This is the payment transaction description.",
    // 	      "related_resources": [
    // 	      ]
    // 	    }
    // 	  ],
    // 	  "create_time": "2016-11-23T23:56:09Z",
    // 	  "links": [
    // 	    { 
    // 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI",
    // 	      "rel": "self",
    // 	      "method": "GET"
    // 	    },
    // 	    { 
    // 	      "href": "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-0BG932459F977083J",
    // 	      "rel": "approval_url",
    // 	      "method": "REDIRECT"
    // 	    },
    // 	    { 
    // 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI/execute",
    // 	      "rel": "execute",
    // 	      "method": "POST"
    // 	    }
    // 	  ]
    // 	}
    }