(.NET Core 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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// 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)
Chilkat.JsonObject jsonToken = new Chilkat.JsonObject();
jsonToken.LoadFile("qa_data/tokens/paypal.json");

// Build the Authorization request header field value.
Chilkat.StringBuilder sbAuth = new Chilkat.StringBuilder();
// 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.
Chilkat.Rest rest = new Chilkat.Rest();
bool bAutoReconnect = true;
bool success = rest.Connect("api.sandbox.paypal.com",443,true,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    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.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.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.");

Debug.WriteLine(json.Emit());

// 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.
Chilkat.StringBuilder sbJsonRequest = new Chilkat.StringBuilder();
json.EmitCompact = true;
json.EmitSb(sbJsonRequest);
Chilkat.StringBuilder sbJsonResponse = new Chilkat.StringBuilder();
success = rest.FullRequestSb("POST","/v1/payments/payment",sbJsonRequest,sbJsonResponse);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

json.EmitCompact = false;
json.LoadSb(sbJsonResponse);

Debug.WriteLine("Response Status Code = " + Convert.ToString(rest.ResponseStatusCode));

// Did we get a 201 success response?
if (rest.ResponseStatusCode != 201) {
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed.");
    return;
}

// Sample JSON response is shown below.
Debug.WriteLine(json.Emit());
Debug.WriteLine("success");

// ------------------------------------------------
// 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"
// 	    }
// 	  ]
// 	}