diff --git a/src/modules/custom-integrations.types.ts b/src/modules/custom-integrations.types.ts
index ecaf024..c887275 100644
--- a/src/modules/custom-integrations.types.ts
+++ b/src/modules/custom-integrations.types.ts
@@ -61,8 +61,8 @@ export interface CustomIntegrationCallResponse {
  * ```typescript
  * // Call a custom GitHub integration
  * const response = await base44.integrations.custom.call(
- *   "github",        // integration slug (defined by workspace admin)
- *   "listIssues",    // operation ID from the OpenAPI spec
+ *   "github",                              // integration slug (defined by workspace admin)
+ *   "get:/repos/{owner}/{repo}/issues",   // endpoint in method:path format
  *   {
  *     pathParams: { owner: "myorg", repo: "myrepo" },
  *     queryParams: { state: "open", per_page: 100 }
@@ -81,7 +81,7 @@ export interface CustomIntegrationCallResponse {
  * // Call with request body payload
  * const response = await base44.integrations.custom.call(
  *   "github",
- *   "createIssue",
+ *   "post:/repos/{owner}/{repo}/issues",
  *   {
  *     pathParams: { owner: "myorg", repo: "myrepo" },
  *     payload: {
@@ -98,7 +98,7 @@ export interface CustomIntegrationsModule {
    * Call a custom integration endpoint.
    *
    * @param slug - The integration's unique identifier (slug), as defined by the workspace admin.
-   * @param operationId - The operation ID from the OpenAPI spec (e.g., "listIssues", "getUser").
+   * @param operationId - The endpoint identifier in method:path format (e.g., "get:/repos/{owner}/{repo}/issues", "get:/users/{username}").
    * @param params - Optional parameters including payload, pathParams, queryParams, and headers.
    * @returns Promise resolving to the integration call response.
    *
diff --git a/src/modules/integrations.types.ts b/src/modules/integrations.types.ts
index e2b36a2..11c903a 100644
--- a/src/modules/integrations.types.ts
+++ b/src/modules/integrations.types.ts
@@ -383,8 +383,8 @@ export type IntegrationsModule = {
    * @example
    * ```typescript
    * const response = await base44.integrations.custom.call(
-   *   "github",        // integration slug
-   *   "listIssues",    // operation ID
+   *   "github",                              // integration slug
+   *   "get:/repos/{owner}/{repo}/issues",   // endpoint in method:path format
    *   {
    *     pathParams: { owner: "myorg", repo: "myrepo" },
    *     queryParams: { state: "open" }
diff --git a/tests/unit/custom-integrations.test.ts b/tests/unit/custom-integrations.test.ts
index 8ceef88..ab34bea 100644
--- a/tests/unit/custom-integrations.test.ts
+++ b/tests/unit/custom-integrations.test.ts
@@ -26,7 +26,7 @@ describe('Custom Integrations Module', () => {
 
   test('custom.call() should convert camelCase params to snake_case for backend', async () => {
     const slug = 'github';
-    const operationId = 'listIssues';
+    const operationId = 'get:/repos/{owner}/{repo}/issues';
     
     // SDK call uses camelCase (JS convention)
     const sdkParams = {
@@ -48,9 +48,10 @@ describe('Custom Integrations Module', () => {
       data: { issues: [{ id: 1, title: 'Test Issue' }] },
     };
 
-    // Mock expects snake_case body
+    // Mock expects snake_case body (curly braces in operationId must be URL-encoded for nock matching)
+    const encodedOperationId = operationId.replace(/{/g, '%7B').replace(/}/g, '%7D');
     scope
-      .post(`/api/apps/${appId}/integrations/custom/${slug}/${operationId}`, expectedBody)
+      .post(`/api/apps/${appId}/integrations/custom/${slug}/${encodedOperationId}`, expectedBody)
       .reply(200, mockResponse);
 
     // SDK call uses camelCase
@@ -135,11 +136,12 @@ describe('Custom Integrations Module', () => {
 
   test('custom.call() should handle 502 error from external API', async () => {
     const slug = 'github';
-    const operationId = 'listIssues';
+    const operationId = 'get:/repos/{owner}/{repo}/issues';
 
-    // Mock a 502 error response (external API failure)
+    // Mock a 502 error response (external API failure) - curly braces in operationId must be URL-encoded
+    const encodedOperationId = operationId.replace(/{/g, '%7B').replace(/}/g, '%7D');
     scope
-      .post(`/api/apps/${appId}/integrations/custom/${slug}/${operationId}`, {})
+      .post(`/api/apps/${appId}/integrations/custom/${slug}/${encodedOperationId}`, {})
       .reply(502, {
         detail: 'Failed to connect to external API: Connection refused',
       });
@@ -169,13 +171,13 @@ describe('Custom Integrations Module', () => {
   });
 
   test('custom.call() should throw error when slug is empty string', async () => {
-    await expect(base44.integrations.custom.call('', 'listIssues')).rejects.toThrow(
+    await expect(base44.integrations.custom.call('', 'get:/repos/{owner}/{repo}/issues')).rejects.toThrow(
       'Integration slug is required and cannot be empty'
     );
   });
 
   test('custom.call() should throw error when slug is whitespace only', async () => {
-    await expect(base44.integrations.custom.call('   ', 'listIssues')).rejects.toThrow(
+    await expect(base44.integrations.custom.call('   ', 'get:/repos/{owner}/{repo}/issues')).rejects.toThrow(
       'Integration slug is required and cannot be empty'
     );
   });
@@ -294,7 +296,7 @@ describe('Custom Integrations Module', () => {
 
   test('custom.call() should only include defined params in body', async () => {
     const slug = 'github';
-    const operationId = 'getUser';
+    const operationId = 'get:/users/{username}';
     
     // SDK call with only pathParams
     const sdkParams = {
@@ -312,8 +314,10 @@ describe('Custom Integrations Module', () => {
       data: { login: 'octocat' },
     };
 
+    // Curly braces in operationId must be URL-encoded for nock matching
+    const encodedOperationId = operationId.replace(/{/g, '%7B').replace(/}/g, '%7D');
     scope
-      .post(`/api/apps/${appId}/integrations/custom/${slug}/${operationId}`, expectedBody)
+      .post(`/api/apps/${appId}/integrations/custom/${slug}/${encodedOperationId}`, expectedBody)
       .reply(200, mockResponse);
 
     const result = await base44.integrations.custom.call(slug, operationId, sdkParams);