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

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

    // 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..
    // ----------------------------------------------------------------------------------------------

    // Build the JSON containing the transaction information.
    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_UpdateString(json,"intent","sale");
    CkJsonObject_UpdateString(json,"redirect_urls.return_url","http://www.example.com/return_url");
    CkJsonObject_UpdateString(json,"redirect_urls.cancel_url","http://www.example.com/cancel_url");
    CkJsonObject_UpdateString(json,"payer.payment_method","paypal");
    CkJsonObject_UpdateString(json,"transactions[0].amount.total","7.47");
    CkJsonObject_UpdateString(json,"transactions[0].amount.currency","USD");
    CkJsonObject_UpdateString(json,"transactions[0].description","This is the payment transaction description.");

    printf("%s\n",CkJsonObject_emit(json));

    // 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."
    // 	    }
    // 	  ]
    // 	}

    CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbAuth));
    CkRest_AddHeader(rest,"Content-Type","application/json");

    // Send the POST request containign the JSON in the request body, and get the JSON response.
    sbJsonRequest = CkStringBuilder_Create();
    CkJsonObject_putEmitCompact(json,TRUE);
    CkJsonObject_EmitSb(json,sbJsonRequest);
    sbJsonResponse = CkStringBuilder_Create();
    success = CkRest_FullRequestSb(rest,"POST","/v1/payments/payment",sbJsonRequest,sbJsonResponse);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbJsonRequest);
        CkStringBuilder_Dispose(sbJsonResponse);
        return;
    }

    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_LoadSb(json,sbJsonResponse);

    printf("Response Status Code = %d\n",CkRest_getResponseStatusCode(rest));

    // Did we get a 201 success response?
    if (CkRest_getResponseStatusCode(rest) != 201) {
        printf("%s\n",CkJsonObject_emit(json));
        printf("Failed.\n");
        CkJsonObject_Dispose(jsonToken);
        CkStringBuilder_Dispose(sbAuth);
        CkRest_Dispose(rest);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbJsonRequest);
        CkStringBuilder_Dispose(sbJsonResponse);
        return;
    }

    // Sample JSON response is shown below.
    printf("%s\n",CkJsonObject_emit(json));
    printf("success\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"
    // 	    }
    // 	  ]
    // 	}


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

    }