class PaymentRequest { PaymentRequest(this.address, this.amount, this.note); factory PaymentRequest.fromUri(Uri uri) { var address = ""; var amount = ""; var note = ""; if (uri != null) { address = uri.path; amount = uri.queryParameters['tx_amount'] ?? uri.queryParameters['amount'] ?? ""; note = uri.queryParameters['tx_description'] ?? uri.queryParameters['message'] ?? ""; } return PaymentRequest(address, amount, note); } final String address; final String amount; final String note; }