(Go) 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.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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 := chilkat.NewJsonObject()
    jsonToken.LoadFile("qa_data/tokens/paypal.json")

    // Build the Authorization request header field value.
    sbAuth := chilkat.NewStringBuilder()
    // 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.
    rest := chilkat.NewRest()
    bAutoReconnect := true
    success := rest.Connect("api.sandbox.paypal.com",443,true,bAutoReconnect)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        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 := chilkat.NewJsonObject()
    json.SetEmitCompact(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.")

    fmt.Println(*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.
    sbJsonRequest := chilkat.NewStringBuilder()
    json.SetEmitCompact(true)
    json.EmitSb(sbJsonRequest)
    sbJsonResponse := chilkat.NewStringBuilder()
    success = rest.FullRequestSb("POST","/v1/payments/payment",sbJsonRequest,sbJsonResponse)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        json.DisposeJsonObject()
        sbJsonRequest.DisposeStringBuilder()
        sbJsonResponse.DisposeStringBuilder()
        return
    }

    json.SetEmitCompact(false)
    json.LoadSb(sbJsonResponse)

    fmt.Println("Response Status Code = ", rest.ResponseStatusCode())

    // Did we get a 201 success response?
    if rest.ResponseStatusCode() != 201 {
        fmt.Println(*json.Emit())
        fmt.Println("Failed.")
        jsonToken.DisposeJsonObject()
        sbAuth.DisposeStringBuilder()
        rest.DisposeRest()
        json.DisposeJsonObject()
        sbJsonRequest.DisposeStringBuilder()
        sbJsonResponse.DisposeStringBuilder()
        return
    }

    // Sample JSON response is shown below.
    fmt.Println(*json.Emit())
    fmt.Println("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"
    // 	    }
    // 	  ]
    // 	}

    jsonToken.DisposeJsonObject()
    sbAuth.DisposeStringBuilder()
    rest.DisposeRest()
    json.DisposeJsonObject()
    sbJsonRequest.DisposeStringBuilder()
    sbJsonResponse.DisposeStringBuilder()