diff --git a/packages/shared-ui/src/flow-gen/app-catalyst.ts b/packages/shared-ui/src/flow-gen/app-catalyst.ts
index 0ed4cafde0f..dae520945fb 100644
--- a/packages/shared-ui/src/flow-gen/app-catalyst.ts
+++ b/packages/shared-ui/src/flow-gen/app-catalyst.ts
@@ -35,13 +35,13 @@ export interface AppCatalystG1CreditsResponse {
 
 export type CheckAppAccessResponse =
   | {
-      canAccess: false;
-      accessStatus: string;
-      termsOfService?: {
-        version: number;
-        terms: string;
-      };
-    }
+    canAccess: false;
+    accessStatus: string;
+    termsOfService?: {
+      version: number;
+      terms: string;
+    };
+  }
   | { canAccess: true; accessStatus: string };
 
 export interface AppCatalystContentChunk {
@@ -99,12 +99,12 @@ export class AppCatalystApiClient {
     request: AppCatalystG1SubscriptionStatusRequest
   ): Promise<AppCatalystG1SubscriptionStatusResponse> {
     const url = new URL("v1beta1/getG1SubscriptionStatus", this.#apiBaseUrl);
-    url.searchParams.set(
-      "include_credit_data",
-      String(request.include_credit_data)
-    );
     const response = await this.#fetchWithCreds(url, {
-      method: "GET",
+      method: "POST",
+      headers: {
+        "content-type": "application/json",
+      },
+      body: JSON.stringify(request),
     });
     if (!response.ok) {
       throw new Error(
@@ -119,7 +119,11 @@ export class AppCatalystApiClient {
   async getG1Credits(): Promise<AppCatalystG1CreditsResponse> {
     const url = new URL("v1beta1/getG1Credits", this.#apiBaseUrl);
     const response = await this.#fetchWithCreds(url, {
-      method: "GET",
+      method: "POST",
+      headers: {
+        "content-type": "application/json",
+      },
+      body: "{}",
     });
     if (!response.ok) {
       throw new Error(`Failed to get G1 credits: ${response.statusText}`);
diff --git a/packages/shared-ui/src/tests/app-catalyst.test.ts b/packages/shared-ui/src/tests/app-catalyst.test.ts
new file mode 100644
index 00000000000..568c4fa118a
--- /dev/null
+++ b/packages/shared-ui/src/tests/app-catalyst.test.ts
@@ -0,0 +1,56 @@
+
+import { test, describe, it, mock } from "node:test";
+import assert from "node:assert";
+import { AppCatalystApiClient } from "../flow-gen/app-catalyst.js";
+
+describe("AppCatalystApiClient", () => {
+  it("should construct correct URL and headers for getG1SubscriptionStatus", async () => {
+    const fetchMock = mock.fn(async (_url: URL | RequestInfo, _init?: RequestInit) => {
+      return new Response(JSON.stringify({ is_member: true, remaining_credits: 10 }), { status: 200 });
+    });
+
+    const client = new AppCatalystApiClient(fetchMock as any, "https://api.example.com");
+    await client.getG1SubscriptionStatus({ include_credit_data: true });
+
+    assert.strictEqual(fetchMock.mock.calls.length, 1);
+    const [url, init] = fetchMock.mock.calls[0].arguments;
+
+    assert.strictEqual(url.toString(), "https://api.example.com/v1beta1/getG1SubscriptionStatus");
+    assert.strictEqual(init?.method, "POST");
+    assert.deepStrictEqual(init?.headers, { "content-type": "application/json" });
+    assert.strictEqual(init?.body, JSON.stringify({ include_credit_data: true }));
+  });
+
+  it("should construct correct URL and headers for getG1Credits", async () => {
+    const fetchMock = mock.fn(async (_url: URL | RequestInfo, _init?: RequestInit) => {
+      return new Response(JSON.stringify({ remaining_credits: 5 }), { status: 200 });
+    });
+
+    const client = new AppCatalystApiClient(fetchMock as any, "https://api.example.com");
+    await client.getG1Credits();
+
+    assert.strictEqual(fetchMock.mock.calls.length, 1);
+    const [url, init] = fetchMock.mock.calls[0].arguments;
+
+    assert.strictEqual(url.toString(), "https://api.example.com/v1beta1/getG1Credits");
+    assert.strictEqual(init?.method, "POST");
+    assert.deepStrictEqual(init?.headers, { "content-type": "application/json" });
+    assert.strictEqual(init?.body, "{}");
+  });
+
+  it("should construct correct URL and headers for checkAppAccess", async () => {
+    const fetchMock = mock.fn(async (_url: URL | RequestInfo, _init?: RequestInit) => {
+      // Mock the response structure expected by checkAppAccess
+      return new Response(JSON.stringify({ accessStatus: "ACCESS_STATUS_OK" }), { status: 200 });
+    });
+
+    const client = new AppCatalystApiClient(fetchMock as any, "https://api.example.com");
+    await client.checkTos();
+
+    assert.strictEqual(fetchMock.mock.calls.length, 1);
+    const [url, init] = fetchMock.mock.calls[0].arguments;
+
+    assert.strictEqual(url.toString(), "https://api.example.com/v1beta1/checkAppAccess");
+    assert.ok(!init?.method || init.method === "GET", "Method should be GET or undefined");
+  });
+});