Init payments message types

ts/types/Payment.ts

@@ -0,0 +1,34 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export enum PaymentEventKind {
+  Notification = 1,
+  ActivationRequest = 2,
+  Activation = 3,
+  // Request = 4, -- disabled
+  // Cancellation = 5, -- disabled
+}
+
+export type PaymentNotificationEvent = {
+  kind: PaymentEventKind.Notification;
+  note: string | null;
+};
+
+export type PaymentActivationRequestEvent = {
+  kind: PaymentEventKind.ActivationRequest;
+};
+
+export type PaymentActivatedEvent = {
+  kind: PaymentEventKind.Activation;
+};
+
+export type AnyPaymentEvent =
+  | PaymentNotificationEvent
+  | PaymentActivationRequestEvent
+  | PaymentActivatedEvent;
+
+export function isPaymentNotificationEvent(
+  event: AnyPaymentEvent
+): event is PaymentNotificationEvent {
+  return event.kind === PaymentEventKind.Notification;
+}