Zig

PayPal -- Get an OAuth 2.0 Access Token

See more PayPal Examples

Demonstrates how to send a request to get a PayPal OAuth2 access token. Sends an HTTP request equivalent to the following:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

Zig

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

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

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    // 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 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;
    };

    // Duplicate this request:

    //     curl https://api.sandbox.paypal.com/v1/oauth2/token \
    //       -H "Accept: application/json" \
    //       -H "Accept-Language: en_US" \
    //       -u "Client-Id:Secret" \
    //       -d "grant_type=client_credentials"

    rest.addHeader("Accept", "application/json") catch {};
    rest.addHeader("Accept-Language", "en_US") catch {};

    // For additional help on where to find  your client ID and API secret, see PayPal Client_ID and API_Secret
    rest.setAuthBasic("PAYPAL_REST_API_CLIENT_ID", "PAYPAL_REST_API_SECRET") catch {};

    rest.addQueryParam("grant_type", "client_credentials") catch {};

    const response_str = rest.fullRequestFormUrlEncoded(alloc, "POST", "/v1/oauth2/token") catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

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

    // A sample response:

    //     {
    //       "scope": "https://api.paypal.com/v1/payments/.* https://api.paypal.com/v1/vault/credit-card https://api.paypal.com/v1/vault/credit-card/.*",
    //       "access_token": "EEwJ6tF9x5WCIZDYzyZGaz6Khbw7raYRIBV_WxVvgmsG",
    //       "token_type": "Bearer",
    //       "app_id": "APP-6XR95014BA15863X",
    //       "expires_in": 28800
    //     }

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.load(response_str) catch {};
    json.setEmitCompact(false);

    // Check the response status code.  A 200 indicates success..
    if (rest.getResponseStatusCode() != 200) {
        std.debug.print("{s}\n", .{try json.emit(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // Given that the access token expires in approx 8 hours,
    // let's record the date/time this token was created.
    // This will allow us to know beforehand if the token
    // is expired (and we can then fetch a new token).
    const date_time = try chilkat.DateTime.init();
    defer date_time.deinit();
    const b_local_time = false;
    const dt_now = @as(i32, @intCast(date_time.getAsUnixTime(b_local_time)));
    json.appendInt("tokenCreateTimeUtc", dt_now) catch {};

    // Examine the access token and save to a file.
    std.debug.print("Access Token: {s}\n", .{try json.stringOf(alloc, "access_token")});
    std.debug.print("Full JSON Response:\n", .{});
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    const sb_response = try chilkat.StringBuilder.init();
    defer sb_response.deinit();
    sb_response.append(try json.emit(alloc)) catch {};
    const b_emit_bom = false;
    sb_response.writeFile("qa_data/tokens/paypal.json", "utf-8", b_emit_bom) catch {};
}