Go Requires Chilkat v11.0.0+

PayPal: Start a PayPal wallet checkout

See more PayPal Examples

Buyer interaction. Your application uses a browser for buyer approval or authentication when PayPal requests it. Configure the merchant return and cancel URLs for this flow.

Create a USD 30 digital order from a trusted cart. Store the order ID and redirect the buyer to the payer-action link. After approval, capture this same order from your merchant application.

PayPal documentation

Go

    success := false

    //  See Unlock Chilkat before making requests.
    //  For the merchant's internal backoffice application. Load the sandbox token
    //  from the merchant's credential store. Keep it out of publicly distributed apps.
    //  See Get a PayPal access token.
    http := chilkat.NewHttp()
    http.SetAuthToken("SANDBOX_ACCESS_TOKEN")
    resp := chilkat.NewHttpResponse()

    //  Replace the two callback URLs with routes on your site. This order contains no
    //  physical shipment.
    //  Create and persist this key once per business operation. On a timeout,
    //  retry the same request with its saved key, not a newly generated one.
    crypt := chilkat.NewCrypt2()
    requestId := crypt.GenerateUuid()
    http.SetRequestHeader("PayPal-Request-Id",*requestId)
    http.SetRequestHeader("Prefer","return=representation")
    body := chilkat.NewJsonObject()
    body.UpdateString("intent","CAPTURE")
    body.UpdateString("purchase_units[0].amount.currency_code","USD")
    body.UpdateString("purchase_units[0].amount.value","30.00")
    body.UpdateString("payment_source.paypal.experience_context.return_url","https://merchant.example/paypal/return")
    body.UpdateString("payment_source.paypal.experience_context.cancel_url","https://merchant.example/paypal/cancel")
    body.UpdateString("payment_source.paypal.experience_context.shipping_preference","NO_SHIPPING")

    success = http.HttpJson("POST","https://api-m.sandbox.paypal.com/v2/checkout/orders",body,"application/json",resp)
    if success != true {
        fmt.Println("No HTTP response: ", http.LastErrorText())
        http.DisposeHttp()
        resp.DisposeHttpResponse()
        crypt.DisposeCrypt2()
        body.DisposeJsonObject()
        return
    }

    if (resp.StatusCode() < 200) || (resp.StatusCode() >= 300) {
        errorInfo := chilkat.NewJsonObject()
        errorInfo.Load(resp.BodyStr())
        fmt.Println("HTTP ", resp.StatusCode(), " ", *errorInfo.StringOf("name"), " ", *errorInfo.StringOf("details[0].issue"))
        fmt.Println("PayPal debug ID: ", *errorInfo.StringOf("debug_id"))
        http.DisposeHttp()
        resp.DisposeHttpResponse()
        crypt.DisposeCrypt2()
        body.DisposeJsonObject()
        errorInfo.DisposeJsonObject()
        return
    }

    result := chilkat.NewJsonObject()
    parsed := result.Load(resp.BodyStr())
    if parsed != true {
        fmt.Println("Expected a JSON response; HTTP ", resp.StatusCode())
        http.DisposeHttp()
        resp.DisposeHttpResponse()
        crypt.DisposeCrypt2()
        body.DisposeJsonObject()
        errorInfo.DisposeJsonObject()
        result.DisposeJsonObject()
        return
    }

    fmt.Println("ID: ", *result.StringOf("id"))
    fmt.Println("Status: ", *result.StringOf("status"))
    //  Link order is not fixed. Send the buyer to the matching URL in a browser.
    linkIndex := 0
    for (linkIndex < result.SizeOfArray("links")) {
        result.SetI(linkIndex)
        if result.StringOfEquals("links[i].rel","payer-action",true) {
            fmt.Println("Approval URL: ", *result.StringOf("links[i].href"))
        }

        linkIndex = linkIndex + 1
    }


    http.DisposeHttp()
    resp.DisposeHttpResponse()
    crypt.DisposeCrypt2()
    body.DisposeJsonObject()
    errorInfo.DisposeJsonObject()
    result.DisposeJsonObject()