feat(payment): add chat support discounts and gratitude

src/stores/chat/machine/session-flow.ts

@@ -1,4 +1,5 @@
 import { createChatPromotionState } from "../helper/promotion";
+import { appendCommercialMessage } from "../helper/commercial-message";
 import { shouldPromptUnlockHistory } from "../helper/unlock";
 import { createInitialChatState } from "../chat-state";
 import {
@@ -53,6 +54,19 @@ const injectPromotionAction = unlockMachineSetup.assign(({ event }) => {
 
 const clearPromotionAction = unlockMachineSetup.assign({ promotion: null });
 
+const appendCommercialMessageAction = unlockMachineSetup.assign(
+  ({ context, event }) => {
+    if (event.type !== "ChatCommercialMessageReceived") return {};
+    return {
+      messages: appendCommercialMessage(
+        context.messages,
+        context.characterId,
+        event.message,
+      ),
+    };
+  },
+);
+
 export const chatMachineSetup = unlockMachineSetup.extend({
   actions: {
     startGuestSession: startGuestSessionAction,
@@ -60,6 +74,7 @@ export const chatMachineSetup = unlockMachineSetup.extend({
     clearChatSession: clearChatSessionAction,
     injectPromotion: injectPromotionAction,
     clearPromotion: clearPromotionAction,
+    appendCommercialMessage: appendCommercialMessageAction,
   },
 });
 
@@ -258,6 +273,7 @@ export const chatRootStateConfig = chatMachineSetup.createStateConfig({
   on: {
     ChatPromotionInjected: { actions: "injectPromotion" },
     ChatPromotionCleared: { actions: "clearPromotion" },
+    ChatCommercialMessageReceived: { actions: "appendCommercialMessage" },
   },
   states: {
     idle: idleState,