(Mono C#) PayPal - Create Stored Credit Card Payment

Creates a credit card payment using a card ID from a previously stored credit card (where the credit card was stored in PayPal's vault).

Note: For sandbox calls, you can use the credit card numbers provided in your sandbox test accounts.

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

// We previously stored the user's credit card data in PayPal's vault.
// See Store Card in PayPal Vault for sample code.

// Build the JSON containing the stored credit card information and transaction information.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.EmitCompact = false;
json.UpdateString("intent","sale");
json.UpdateString("payer.payment_method","credit_card");
json.UpdateString("payer.funding_instruments[0].credit_card_token.credit_card_id","CARD-52W84623JH8043102LA3CLGA");
json.UpdateString("payer.funding_instruments[0].credit_card_token.payer_id","user12345");
json.UpdateString("transactions[0].amount.total","6.70");
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",
// 	  "payer": { 
// 	    "payment_method": "credit_card",
// 	    "funding_instruments": [
// 	      { 
// 	        "credit_card_token": { 
// 	          "credit_card_id": "CARD-52W84623JH8043102LA3CLGA",
// 	          "payer_id": "user12345"
// 	        }
// 	      }
// 	    ]
// 	  },
// 	  "transactions": [
// 	    { 
// 	      "amount": { 
// 	        "total": "6.70",
// 	        "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());

// Demonstrate how to access a few parts of the JSON response..
Debug.WriteLine("credit_card_id: " + json.StringOf("payer.funding_instruments[0].credit_card_token.credit_card_id"));
Debug.WriteLine("subtotal: " + json.StringOf("transactions[0].amount.details.subtotal"));
Debug.WriteLine("refund href: " + json.StringOf("transactions[0].related_resources[0].sale.links[1].href"));
Debug.WriteLine("success");

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

// 	{ 
// 	  "id": "PAY-12T35751GS725073SLA3CQNQ",
// 	  "create_time": "2016-11-23T23:37:26Z",
// 	  "update_time": "2016-11-23T23:37:31Z",
// 	  "state": "approved",
// 	  "intent": "sale",
// 	  "payer": { 
// 	    "payment_method": "credit_card",
// 	    "funding_instruments": [
// 	      { 
// 	        "credit_card_token": { 
// 	          "credit_card_id": "CARD-52W84623JH8043102LA3CLGA",
// 	          "payer_id": "user12345",
// 	          "last4": "9974",
// 	          "type": "visa",
// 	          "expire_month": "9",
// 	          "expire_year": "2021"
// 	        }
// 	      }
// 	    ]
// 	  },
// 	  "transactions": [
// 	    { 
// 	      "amount": { 
// 	        "total": "6.70",
// 	        "currency": "USD",
// 	        "details": { 
// 	          "subtotal": "6.70"
// 	        }
// 	      },
// 	      "description": "This is the payment transaction description.",
// 	      "related_resources": [
// 	        { 
// 	          "sale": { 
// 	            "id": "4F194018A1618453G",
// 	            "create_time": "2016-11-23T23:37:26Z",
// 	            "update_time": "2016-11-23T23:37:31Z",
// 	            "amount": { 
// 	              "total": "6.70",
// 	              "currency": "USD"
// 	            },
// 	            "state": "completed",
// 	            "parent_payment": "PAY-12T35751GS725073SLA3CQNQ",
// 	            "links": [
// 	              { 
// 	                "href": "https://api.sandbox.paypal.com/v1/payments/sale/4F194018A1618453G",
// 	                "rel": "self",
// 	                "method": "GET"
// 	              },
// 	              { 
// 	                "href": "https://api.sandbox.paypal.com/v1/payments/sale/4F194018A1618453G/refund",
// 	                "rel": "refund",
// 	                "method": "POST"
// 	              },
// 	              { 
// 	                "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-12T35751GS725073SLA3CQNQ",
// 	                "rel": "parent_payment",
// 	                "method": "GET"
// 	              }
// 	            ],
// 	            "fmf_details": {},
// 	            "processor_response": { 
// 	              "avs_code": "X",
// 	              "cvv_code": "M"
// 	            }
// 	          }
// 	        }
// 	      ]
// 	    }
// 	  ],
// 	  "links": [
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-12T35751GS725073SLA3CQNQ",
// 	      "rel": "self",
// 	      "method": "GET"
// 	    }
// 	  ]
// 	}
//