flutter_wing_checkout library

Flutter checkout for Wing Bank online payment. Re-exports dart_wing, so one import gives both the widgets and the API client.

Classes

CancelToken: Controls cancellation of Dio's requests.
InAppWebViewController
WingAuthorizationResponse: Response of the authorization API.
WingCheckoutResult: The redirect that ended a checkout.
WingCheckoutView: Wing's payment page in a web view. It reports how the checkout ended as soon as Wing redirects to returnUrl or cancelUrl, without loading them.
WingCrypto: Encryption and hashing matching PHP's openssl_encrypt($data, 'AES-256-CBC', $key, 0, $iv), the function of the PHP sample in Wing's Web SDK spec: the key is the UTF-8 password, NUL-padded or truncated to 32 bytes; the IV is 16 bytes; PKCS#7 padding; base64 output.
WingInquiryResponse: Response of the transaction inquiry API.
WingMerchant: Partner credentials provided by Wing Bank.
WingPayment: Payment to authorize. rand_str and timestamp are generated by the SDK; every optional field is sent only when set.
WingRequestBuilder: Builds the encrypted and hashed request bodies of the Wing online payment APIs.
WingService: Wing Bank online payment (Web SDK v2) client.
WingStatus: errorCode and errorText of Wing responses. Success is 200.
WingTransaction: A Wing payment, as returned by the inquiry API and pushed to your callback URL.

WingCheckoutStatus: How a checkout on Wing's payment page ended.
WingErrorType: What went wrong in a WingException.
WingIntegrationType: Where Wing sends the payer after paying (integration_type).

WingClock = DateTime Function(): returns the current time; injectable so timestamp can be tested
WingLogger = void Function(String message): receives request/response log lines
WingRandom = String Function(): returns a fresh rand_str: 16 characters among 0-9 and a-f

WingException: Thrown when Wing could not be reached or did not answer with an errorCode, and for invalid local input such as a short password.