diff --git a/packages/cloud/src/libraries/services.ts b/packages/cloud/src/libraries/services.ts
index 35965cc2c..ae29c31e9 100644
--- a/packages/cloud/src/libraries/services.ts
+++ b/packages/cloud/src/libraries/services.ts
@@ -16,6 +16,7 @@ import { RequestError } from '@withtyped/server';
 import type { Queries } from '#src/queries/index.js';
 import type { LogtoConnector } from '#src/utils/connector/index.js';
 import { loadConnectorFactories } from '#src/utils/connector/index.js';
+import { jsonObjectGuard } from '#src/utils/guard.js';
 
 export const serviceCountLimitForTenant = 100;
 
@@ -107,11 +108,12 @@ export class ServicesLibrary {
     return sendMessage(data);
   }
 
-  async addLog(tenantId: string, type: ServiceLogType) {
+  async addLog(tenantId: string, type: ServiceLogType, payload?: unknown) {
     return this.queries.serviceLogs.insertLog({
       id: generateStandardId(),
       type,
       tenantId,
+      payload: trySafe(() => jsonObjectGuard.parse(payload)),
     });
   }
 
diff --git a/packages/cloud/src/queries/service-logs.ts b/packages/cloud/src/queries/service-logs.ts
index 5858346d3..4b296d2c7 100644
--- a/packages/cloud/src/queries/service-logs.ts
+++ b/packages/cloud/src/queries/service-logs.ts
@@ -1,14 +1,14 @@
 import type { CreateServiceLog, ServiceLogType } from '@logto/schemas';
 import type { PostgreSql } from '@withtyped/postgres';
 import { sql } from '@withtyped/postgres';
-import type { Queryable } from '@withtyped/server';
+import type { JsonObject, Queryable } from '@withtyped/server';
 
 import { insertInto } from '#src/utils/query.js';
 
 export type ServiceLogsQueries = ReturnType<typeof createServiceLogsQueries>;
 
 export const createServiceLogsQueries = (client: Queryable<PostgreSql>) => {
-  const insertLog = async (data: Omit<CreateServiceLog, 'payload'>) =>
+  const insertLog = async (data: Omit<CreateServiceLog, 'payload'> & { payload?: JsonObject }) =>
     client.query(insertInto(data, 'service_logs'));
 
   const countTenantLogs = async (tenantId: string, type: ServiceLogType) => {
diff --git a/packages/cloud/src/routes/service.test.ts b/packages/cloud/src/routes/service.test.ts
index 7530ba202..666df99ad 100644
--- a/packages/cloud/src/routes/service.test.ts
+++ b/packages/cloud/src/routes/service.test.ts
@@ -65,7 +65,9 @@ describe('POST /api/services/send-email', () => {
       async ({ status }) => {
         expect(status).toBe(201);
         expect(library.sendMessage).toBeCalledWith(ConnectorType.Email, mockSendMessagePayload);
-        expect(library.addLog).toBeCalledWith('tenantId', ServiceLogType.SendEmail);
+        expect(library.addLog).toBeCalledWith('tenantId', ServiceLogType.SendEmail, {
+          data: mockSendMessagePayload,
+        });
       },
       createHttpContext()
     );
@@ -125,7 +127,9 @@ describe('POST /api/services/send-sms', () => {
       async ({ status }) => {
         expect(status).toBe(201);
         expect(library.sendMessage).toBeCalledWith(ConnectorType.Sms, mockSendMessagePayload);
-        expect(library.addLog).toBeCalledWith('tenantId', ServiceLogType.SendSms);
+        expect(library.addLog).toBeCalledWith('tenantId', ServiceLogType.SendSms, {
+          data: mockSendMessagePayload,
+        });
       },
       createHttpContext()
     );
diff --git a/packages/cloud/src/routes/services.ts b/packages/cloud/src/routes/services.ts
index 51c719358..8247e4a9c 100644
--- a/packages/cloud/src/routes/services.ts
+++ b/packages/cloud/src/routes/services.ts
@@ -29,7 +29,7 @@ export const servicesRoutes = (library: ServicesLibrary) =>
         }
 
         await library.sendMessage(ConnectorType.Email, context.guarded.body.data);
-        await library.addLog(tenantId, ServiceLogType.SendEmail);
+        await library.addLog(tenantId, ServiceLogType.SendEmail, context.guarded.body);
 
         return next({ ...context, status: 201 });
       }
@@ -55,7 +55,7 @@ export const servicesRoutes = (library: ServicesLibrary) =>
         }
 
         await library.sendMessage(ConnectorType.Sms, context.guarded.body.data);
-        await library.addLog(tenantId, ServiceLogType.SendSms);
+        await library.addLog(tenantId, ServiceLogType.SendSms, context.guarded.body);
 
         return next({ ...context, status: 201 });
       }
diff --git a/packages/cloud/src/utils/guard.ts b/packages/cloud/src/utils/guard.ts
new file mode 100644
index 000000000..1298fe9f8
--- /dev/null
+++ b/packages/cloud/src/utils/guard.ts
@@ -0,0 +1,13 @@
+import type { Json } from '@withtyped/server';
+import { z } from 'zod';
+
+/**
+ * `jsonGuard` copied from https://github.com/colinhacks/zod#json-type.
+ * Can be moved to @logto/shared if needed.
+ */
+
+const jsonGuard: z.ZodType<Json> = z.lazy(() =>
+  z.union([z.number(), z.boolean(), z.string(), z.null(), z.array(jsonGuard), z.record(jsonGuard)])
+);
+
+export const jsonObjectGuard = z.record(jsonGuard);