Zig

PayPal - Create a PayPal Payment

See more PayPal Examples

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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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)
    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    json_token.loadFile("qa_data/tokens/paypal.json") catch {};

    // Build the Authorization request header field value.
    const sb_auth = try chilkat.StringBuilder.init();
    defer sb_auth.deinit();
    // token_type should be "Bearer"
    sb_auth.append(try json_token.stringOf(alloc, "token_type")) catch {};
    sb_auth.append(" ") catch {};
    sb_auth.append(try json_token.stringOf(alloc, "access_token")) catch {};

    // 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.
    const rest = try chilkat.Rest.init();
    defer rest.deinit();
    const b_auto_reconnect = true;
    rest.connect("api.sandbox.paypal.com", 443, true, b_auto_reconnect) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        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.
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.setEmitCompact(false);
    json.updateString("intent", "sale") catch {};
    json.updateString("redirect_urls.return_url", "http://www.example.com/return_url") catch {};
    json.updateString("redirect_urls.cancel_url", "http://www.example.com/cancel_url") catch {};
    json.updateString("payer.payment_method", "paypal") catch {};
    json.updateString("transactions[0].amount.total", "7.47") catch {};
    json.updateString("transactions[0].amount.currency", "USD") catch {};
    json.updateString("transactions[0].description", "This is the payment transaction description.") catch {};

    std.debug.print("{s}\n", .{try json.emit(alloc)});

    // 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", try sb_auth.getAsString(alloc)) catch {};
    rest.addHeader("Content-Type", "application/json") catch {};

    // Send the POST request containign the JSON in the request body, and get the JSON response.
    const sb_json_request = try chilkat.StringBuilder.init();
    defer sb_json_request.deinit();
    json.setEmitCompact(true);
    json.emitSb(sb_json_request) catch {};
    const sb_json_response = try chilkat.StringBuilder.init();
    defer sb_json_response.deinit();
    rest.fullRequestSb("POST", "/v1/payments/payment", sb_json_request, sb_json_response) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    json.setEmitCompact(false);
    json.loadSb(sb_json_response) catch {};

    std.debug.print("Response Status Code = {d}\n", .{rest.getResponseStatusCode()});

    // Did we get a 201 success response?
    if (rest.getResponseStatusCode() != 201) {
        std.debug.print("{s}\n", .{try json.emit(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // Sample JSON response is shown below.
    std.debug.print("{s}\n", .{try json.emit(alloc)});
    std.debug.print("success\n", .{});

    // ------------------------------------------------
    // 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"
    //         }
    //       ]
    //     }
}