(Swift 3,4,5...) PayPal - Execute Approved PayPal Payment

Executes an approved PayPal payment. (This is for executing an approved PayPal payment, not a credit card payment.)

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

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func chilkatTest() {
    // 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)
    let jsonToken = CkoJsonObject()!
    jsonToken.loadFile("qa_data/tokens/paypal.json")

    // Build the Authorization request header field value.
    let sbAuth = CkoStringBuilder()!
    // token_type should be "Bearer"
    sbAuth.append(jsonToken.string(of: "token_type"))
    sbAuth.append(" ")
    sbAuth.append(jsonToken.string(of: "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.
    let rest = CkoRest()!
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect("api.sandbox.paypal.com", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(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 payer_id
    let json = CkoJsonObject()!
    json.emitCompact = false
    json.append("payer_id", value: "RRCYJUTFJGZTA")
    print("\(json.emit()!)")

    // The JSON created by the above code:

    // 	{ 
    // 	  "payer_id": "RRCYJUTFJGZTA"
    // 	}

    rest.addHeader("Authorization", value: sbAuth.getAsString())
    rest.addHeader("Content-Type", value: "application/json")

    // The payment ID is passed in the path.
    let sbPath = CkoStringBuilder()!
    sbPath.append("/v1/payments/payment/payment_id/execute")
    var numReplaced: Int = sbPath.replace("payment_id", replacement: "PAY-4N746561P0587231SKQQK6MY").intValue

    // Send the POST request containign the JSON in the request body, and get the JSON response.
    let sbJsonRequest = CkoStringBuilder()!
    json.emitCompact = true
    json.emitSb(sbJsonRequest)
    let sbJsonResponse = CkoStringBuilder()!
    success = rest.fullRequestSb("POST", uriPath: sbPath.getAsString(), requestBody: sbJsonRequest, responseBody: sbJsonResponse)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    json.emitCompact = false
    json.loadSb(sbJsonResponse)

    print("Response Status Code = \(rest.responseStatusCode.intValue)")

    // Did we get a 200 success response?
    if rest.responseStatusCode.intValue != 200 {
        print("\(json.emit()!)")
        print("Failed.")
        return
    }

    // Sample JSON response is shown below.
    print("\(json.emit()!)")

    print("success")

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

    // 	{ 
    // 	  "id": "PAY-4N746561P0587231SKQQK6MY",
    // 	  "create_time": "2014-09-22T23:22:27Z",
    // 	  "update_time": "2014-09-22T23:31:13Z",
    // 	  "state": "approved",
    // 	  "intent": "sale",
    // 	  "payer": { 
    // 	    "payment_method": "paypal",
    // 	    "payer_info": { 
    // 	      "email": "npurayil-uspr-60@paypal.com",
    // 	      "first_name": "Brian",
    // 	      "last_name": "Robinson",
    // 	      "payer_id": "JMKDKJ4D7DG7G",
    // 	      "shipping_address": { 
    // 	        "line1": "4thFloor",
    // 	        "line2": "unit#34",
    // 	        "city": "SAn Jose",
    // 	        "state": "CA",
    // 	        "postal_code": "95131",
    // 	        "country_code": "US",
    // 	        "phone": "011862212345678",
    // 	        "recipient_name": "HelloWorld"
    // 	      }
    // 	    }
    // 	  },
    // 	  "transactions": [
    // 	    { 
    // 	      "amount": { 
    // 	        "total": "30.11",
    // 	        "currency": "USD",
    // 	        "details": { 
    // 	          "subtotal": "30.00",
    // 	          "tax": "0.07",
    // 	          "shipping": "0.03",
    // 	          "handling_fee": "1.00",
    // 	          "insurance": "0.01",
    // 	          "shipping_discount": "-1.00"
    // 	        }
    // 	      },
    // 	      "description": "This is the payment transaction description.",
    // 	      "item_list": { 
    // 	        "items": [
    // 	          { 
    // 	            "name": "hat",
    // 	            "sku": "1",
    // 	            "price": "3.00",
    // 	            "currency": "USD",
    // 	            "quantity": "5",
    // 	            "description": "Brown color hat",
    // 	            "tax": "0.01"
    // 	          },
    // 	          { 
    // 	            "name": "handbag",
    // 	            "sku": "product34",
    // 	            "price": "15.00",
    // 	            "currency": "USD",
    // 	            "quantity": "1",
    // 	            "description": "Black color handbag",
    // 	            "tax": "0.02"
    // 	          }
    // 	        ],
    // 	        "shipping_address": { 
    // 	          "recipient_name": "HelloWorld",
    // 	          "line1": "4thFloor",
    // 	          "line2": "unit#34",
    // 	          "city": "SAn Jose",
    // 	          "state": "CA",
    // 	          "phone": "011862212345678",
    // 	          "postal_code": "95131",
    // 	          "country_code": "US"
    // 	        }
    // 	      },
    // 	      "related_resources": [
    // 	        { 
    // 	          "sale": { 
    // 	            "id": "4XP56210M0797192Y",
    // 	            "create_time": "2014-09-22T23:22:27Z",
    // 	            "update_time": "2014-09-22T23:31:13Z",
    // 	            "amount": { 
    // 	              "total": "30.11",
    // 	              "currency": "USD"
    // 	            },
    // 	            "payment_mode": "INSTANT_TRANSFER",
    // 	            "state": "completed",
    // 	            "protection_eligibility": "ELIGIBLE",
    // 	            "protection_eligibility_type": "ITEM_NOT_RECEIVED_ELIGIBLE",
    // 	            "transaction_fee": { 
    // 	              "value": "1.75",
    // 	              "currency": "USD"
    // 	            },
    // 	            "parent_payment": "PAY-4N746561P0587231SKQQK6MY",
    // 	            "links": [
    // 	              { 
    // 	                "href": "https://api.paypal.com/v1/payments/sale/4XP56210M0797192Y",
    // 	                "rel": "self",
    // 	                "method": "GET"
    // 	              },
    // 	              { 
    // 	                "href": "https://api.paypal.com/v1/payments/sale/4XP56210M0797192Y/refund",
    // 	                "rel": "refund",
    // 	                "method": "POST"
    // 	              },
    // 	              { 
    // 	                "href": "https://api.paypal.com/v1/payments/payment/PAY-4N746561P0587231SKQQK6MY",
    // 	                "rel": "parent_payment",
    // 	                "method": "GET"
    // 	              }
    // 	            ]
    // 	          }
    // 	        }
    // 	      ]
    // 	    }
    // 	  ],
    // 	  "links": [
    // 	    { 
    // 	      "href": "https://api.paypal.com/v1/payments/payment/PAY-4N746561P0587231SKQQK6MY",
    // 	      "rel": "self",
    // 	      "method": "GET"
    // 	    }
    // 	  ]
    // 	}

}