diff --git a/scripts/tests/wechatAuthorization.test.mjs b/scripts/tests/wechatAuthorization.test.mjs
new file mode 100644
index 0000000..c110ab3
--- /dev/null
+++ b/scripts/tests/wechatAuthorization.test.mjs
@@ -0,0 +1,108 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import { createRequire } from 'node:module'
+import ts from 'typescript'
+import * as vue from 'vue'
+import { compileScript, parse } from '@vue/compiler-sfc'
+
+const require = createRequire(import.meta.url)
+const elementPlusRequire = createRequire(require.resolve('element-plus'))
+const Schema = elementPlusRequire('async-validator').default
+const { descriptor } = parse(
+  readFileSync(
+    'src/views/settings/payment-merchant-pools/components/WechatAuthorizationManagement.vue',
+    'utf8'
+  )
+)
+const compiled = ts.transpileModule(
+  compileScript(descriptor, { id: 'wechat-authorization-test' }).content,
+  { compilerOptions: { target: ts.ScriptTarget.ES2022, module: ts.ModuleKind.CommonJS } }
+).outputText
+
+function harness() {
+  const calls = []
+  const imports = {
+    vue: { ...vue, onMounted: () => {}, onUnmounted: () => {} },
+    'element-plus': { ElMessage: { success: () => {} } },
+    '@/api/modules': {
+      PaymentMerchantPoolsService: {
+        updateWechatAuthorization: async (payload) => {
+          calls.push({ ...payload })
+          return { code: 0, data: payload }
+        }
+      }
+    },
+    '@/composables/useAuth': { useAuth: () => ({ hasAuth: () => true }) },
+    '@/config/constants/paymentMerchantPools': {
+      PAYMENT_MERCHANT_POOL_PERMISSIONS: { wechatAuthEdit: 'wechat_auth_edit' }
+    }
+  }
+  const module = { exports: {} }
+  new Function('require', 'module', 'exports', 'computed', compiled)(
+    (name) => {
+      assert.ok(imports[name], `Unexpected runtime dependency: ${name}`)
+      return imports[name]
+    },
+    module,
+    module.exports,
+    vue.computed
+  )
+  const state = module.exports.default.setup({}, { expose: () => {} })
+  state.formRef.value = {
+    validate: () => new Schema(state.formRules).validate(state.form)
+  }
+  return { state, calls }
+}
+
+test('miniapp AppID starts empty without default or placeholder text', () => {
+  const { state } = harness()
+  assert.equal(state.form.miniapp_app_id, '')
+  const input = descriptor.template.content.match(
+    /<ElInput\b[^>]*v-model="form\.miniapp_app_id"[^>]*\/>/
+  )?.[0]
+  assert.ok(input)
+  assert.doesNotMatch(input, /\b(?:placeholder|(?:default-)?value)\s*=/)
+})
+
+for (const enabled of [false, true]) {
+  for (const miniappAppId of ['', '   ', null, undefined]) {
+    test(`saves ${enabled ? 'enabled' : 'disabled'} authorization without optional AppID ${JSON.stringify(miniappAppId)}`, async () => {
+      const { state, calls } = harness()
+      Object.assign(state.form, {
+        enabled,
+        miniapp_app_id: miniappAppId,
+        oa_app_id: 'wx-official-account',
+        oa_oauth_redirect_url: 'https://example.com/oauth'
+      })
+      await state.handleSubmit()
+
+      assert.deepEqual(calls, [
+        {
+          enabled,
+          oa_app_id: 'wx-official-account',
+          oa_oauth_redirect_url: 'https://example.com/oauth'
+        }
+      ])
+    })
+  }
+}
+
+test('submits a provided miniapp AppID after trimming and clears sensitive inputs after saving', async () => {
+  const { state, calls } = harness()
+  state.form.miniapp_app_id = '  wx-miniapp  '
+  state.sensitive.miniapp_app_secret = 'new-miniapp-secret'
+  await state.handleSubmit()
+
+  assert.equal(calls[0].miniapp_app_id, 'wx-miniapp')
+  assert.equal(calls[0].miniapp_app_secret, 'new-miniapp-secret')
+  assert.equal(state.sensitive.miniapp_app_secret, '')
+})
+
+test('still rejects a miniapp AppID longer than 64 characters', async () => {
+  const { state, calls } = harness()
+  state.form.miniapp_app_id = 'x'.repeat(65)
+  await state.handleSubmit()
+
+  assert.deepEqual(calls, [])
+})
diff --git a/src/views/settings/payment-merchant-pools/components/WechatAuthorizationManagement.vue b/src/views/settings/payment-merchant-pools/components/WechatAuthorizationManagement.vue
index 8406be0..92ac6f0 100644
--- a/src/views/settings/payment-merchant-pools/components/WechatAuthorizationManagement.vue
+++ b/src/views/settings/payment-merchant-pools/components/WechatAuthorizationManagement.vue
@@ -23,8 +23,8 @@
           <ElSwitch v-model="form.enabled" active-text="启用" inactive-text="停用" />
         </ElFormItem>
         <ElDivider content-position="left">小程序授权</ElDivider>
-        <ElFormItem label="小程序 AppID" prop="miniapp_app_id">
-          <ElInput v-model="form.miniapp_app_id" maxlength="64" placeholder="请输入小程序 AppID" />
+        <ElFormItem label="小程序 AppID（选填）" prop="miniapp_app_id">
+          <ElInput v-model="form.miniapp_app_id" maxlength="64" />
         </ElFormItem>
         <ElFormItem label="小程序 AppSecret">
           <ElInput
@@ -163,11 +163,15 @@
 
     const payload: UpdateWechatAuthorizationRequest = {
       enabled: form.enabled,
-      miniapp_app_id: form.miniapp_app_id?.trim() || '',
       oa_app_id: form.oa_app_id?.trim() || '',
       oa_oauth_redirect_url: form.oa_oauth_redirect_url?.trim() || ''
     }
 
+    const miniappAppId = form.miniapp_app_id?.trim()
+    if (miniappAppId) {
+      payload.miniapp_app_id = miniappAppId
+    }
+
     if (sensitive.miniapp_app_secret) {
       payload.miniapp_app_secret = sensitive.miniapp_app_secret
     }