C# Requires Chilkat v11.0.0+

PayPal: Create an order for later authorization

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.

Use AUTHORIZE when fulfillment will happen later. Creating the order neither obtains consent nor reserves funds. After buyer approval, authorize the order to obtain an authorization ID.

PayPal documentation

C#

bool 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.
Chilkat.Http http = new Chilkat.Http();
http.AuthToken = "SANDBOX_ACCESS_TOKEN";
Chilkat.HttpResponse resp = new Chilkat.HttpResponse();

//  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.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
string requestId = crypt.GenerateUuid();
http.SetRequestHeader("PayPal-Request-Id",requestId);
http.SetRequestHeader("Prefer","return=representation");
Chilkat.JsonObject body = new Chilkat.JsonObject();
body.UpdateString("intent","AUTHORIZE");
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) {
    Debug.WriteLine("No HTTP response: " + http.LastErrorText);
    return;
}

if ((resp.StatusCode < 200) || (resp.StatusCode >= 300)) {
    Chilkat.JsonObject errorInfo = new Chilkat.JsonObject();
    errorInfo.Load(resp.BodyStr);
    Debug.WriteLine("HTTP " + Convert.ToString(resp.StatusCode) + " " + errorInfo.StringOf("name") + " " + errorInfo.StringOf("details[0].issue"));
    Debug.WriteLine("PayPal debug ID: " + errorInfo.StringOf("debug_id"));
    return;
}

Chilkat.JsonObject result = new Chilkat.JsonObject();
bool parsed = result.Load(resp.BodyStr);
if (parsed != true) {
    Debug.WriteLine("Expected a JSON response; HTTP " + Convert.ToString(resp.StatusCode));
    return;
}

Debug.WriteLine("ID: " + result.StringOf("id"));
Debug.WriteLine("Status: " + result.StringOf("status"));
//  Link order is not fixed. Send the buyer to the matching URL in a browser.
int linkIndex = 0;
while ((linkIndex < result.SizeOfArray("links"))) {
    result.I = linkIndex;
    if (result.StringOfEquals("links[i].rel","payer-action",true)) {
        Debug.WriteLine("Approval URL: " + result.StringOf("links[i].href"));
    }

    linkIndex = linkIndex + 1;
}