C# Requires Chilkat v11.0.0+

PayPal: Create a reusable payment link for a service

See more PayPal Examples

Offer an annual inspection for USD 90 through PayPal-hosted checkout. Store the returned resource ID with the catalog item and share the payment_link URL with customers.

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 thank-you URL with your business website. The same link can be shared
//  with several customers.
//  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);
Chilkat.JsonObject body = new Chilkat.JsonObject();
body.UpdateString("integration_mode","LINK");
body.UpdateString("type","BUY_NOW");
body.UpdateString("reusable","MULTIPLE");
body.UpdateString("return_url","https://merchant.example/thank-you");
body.UpdateString("line_items[0].name","Annual inspection");
body.UpdateString("line_items[0].unit_amount.currency_code","USD");
body.UpdateString("line_items[0].unit_amount.value","90.00");

success = http.HttpJson("POST","https://api-m.sandbox.paypal.com/v1/checkout/payment-resources",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 parsedResult = result.Load(resp.BodyStr);
if (parsedResult != true) {
    Debug.WriteLine("Expected a JSON response; HTTP " + Convert.ToString(resp.StatusCode));
    return;
}

Debug.WriteLine("Catalog payment resource ID: " + result.StringOf("id"));
//  Link order is not fixed. Find the customer-facing link to copy into an email.
int linkIndex = 0;
while ((linkIndex < result.SizeOfArray("links"))) {
    result.I = linkIndex;
    if (result.StringOfEquals("links[i].rel","payment_link",true)) {
        Debug.WriteLine("Share this payment link: " + result.StringOf("links[i].href"));
    }

    linkIndex = linkIndex + 1;
}